Lz home is ADSL, right?
First of all, lz can rule out whether it is infected with devil wave virus, which will lead to adsl automatic restart.
When the computer is not caught, most of the reasons are static problems of your computer.
The following is the content copied online. Although it is plagiarism, I hope it will be useful for your starting point.
Analysis and treatment of 8 kinds of ADSL disconnection faults
ADSL disconnection involves many problems, including line failure (line interference), ADSL modem failure (fever, quality, compatibility), network card failure (slow speed, outdated drive) and so on. Operators and users should do the following routine checks: whether ADSL telephone line connectors are reliable; Whether to stay away from power lines and high-power electronic equipment; Whether the telephone extension, fax machine, electric meter and other equipment are installed between ADSL home line and separator: whether the separator is installed correctly; Eliminate the old ISA network card and replace it with 10/ 100M PCI network card and the latest driver; Whether ADSL modem has good heat dissipation; Whether the indicator light of ADSL modem is normal.
The reasons and treatment methods of ADSL disconnection are as follows:
(1) Quality problem of grounding wire. The grounding performance of PC must be good. Otherwise, static electricity will affect the transmission rate of ADSL, and even lead to disconnection. Generally, the grounding resistance of PC should be less than10Ω. In addition, due to the irregular power supply layout during construction, some of them have no grounding wire, or the quality of grounding wire is unqualified, which will also affect the normal use of network equipment and even lead to disconnection problems, and should be rectified in time.
(2) The line has strong interference sources. Strong signal interference sources, such as radio towers, welding machines, trams or high-voltage power transformers, within the range of1000 m of subscriber cable lines, make users receive off-line clutter (copper-clad steel wires have weak shielding and strong signal receiving ability), which causes strong interference to subscriber lines. The interfered signal often enters from the unshielded downlink part, because the relay cable has a shielding layer, and the interference effect is very small. If some shielded downlink lines are used in places with high interference, it will reduce the rate instability or dropped line caused by interference. In addition, the power cord should not be parallel to the ADSL line to prevent ADSL failure caused by crosstalk.
(3) The quality of the network card is unstable. The fault phenomenon is that once the network is disconnected, it can't be connected again. The DSL light of the user's modem is always on, which basically eliminates the line fault, and most of the problems are on the network card. If the problems of network cable, microcomputer and slot are eliminated, the quality of network card is generally unstable, so the network card should be replaced in time.
(4) The subscriber line is far away. Irregular dropped lines are mostly caused by poor line quality or too long distance. ADSL tester can be used to test signal attenuation and interference intensity to find a better line replacement. The average user's trunk line should not exceed 5km, and the telephone line entering the user's room from the junction box should not exceed1000 mm.
(5) You can surf the Internet, but your mobile phone is disconnected. Most of the reason is that the terminal board wire in the handover room is stuck, because the disconnected head is very close to the terminal board, so the data induction can pass, but the voice can't; If the user is close to the local office, the indoor line mixing will also cause the above faults.
(6) Internet access and phone calls are not balanced. Generally, the external insulation is poor or the joint contact is poor. The external insulation of the client is poor. When users surf the Internet, as soon as they hold the phone handle, the alarm light flashes and the WAN light goes out. After the external line is repaired, the fault will be relieved immediately.
(7) Can talk, but disconnected. Generally, the user connects the wrong line, the modem line answers the phone, the phone can be used, and the Internet is disconnected. At this time, the ADSL Modem status light line light does not light up. When troubleshooting, first of all, carefully check the wiring position of the equipment, and change it as little as possible at ordinary times to avoid wiring errors.
(8) Wrong telephone extension. Incorrect connection of telephone extension will lead to crosstalk and distortion of Internet data. If a telephone extension must be used, a splitter should be connected in series.
Manual for rapid troubleshooting of ADSL dropped fault
The following are common problems and solutions.
Is the power signal light on?
Once ADSL is disconnected, you can immediately check whether the power signal lamp of ADSL modem is on, so as to rule out whether it is disconnected due to power failure.
If the power signal light is not on, you should concentrate on solving the power problem. For example, whether the line is disconnected due to the instability of the mains power supply, whether the ADSL modem itself has a power supply problem, and so on. If the power signal light is on all the time, it means that the disconnection fault has nothing to do with the power supply, and you have to continue to investigate.
Tip: If you touch the ADSL modem shell with your hand, it feels very hot. At this time, you may wish to temporarily turn off the ADSL modem, wait for it to cool down and then turn it on or put it in a ventilated place, or you can eliminate the disconnection fault.
Is the data signal normal?
Check whether the communication line is normal by checking the data signal lamp status of ADSL modem.
If the data signal light is not on, it is likely that the line is open or short-circuited, and then a telephone test is conducted to see if the line is normal. If it is not normal, you can ask the technical staff of ADSL service provider to solve this problem.
If the data signal light flashes, it is probably caused by poor line contact. You must check whether the extension is used, whether the connector is firm, and whether the ADSL cable is too long. If the data signal lamp still does not light up after checking the above factors, it means that the fault has nothing to do with the line.
Network card status
Under normal circumstances, after the network card in the computer is connected to the ADSL modem through the network cable, its signal light should remain flashing or always on. If it doesn't flash, it is likely that the connection between the network card and the network cable has failed. At this time, you can check whether the network card is loose, whether the network card driver is installed correctly, whether the network card resources conflict, and whether the network cable connector is loose. If it still can't return to normal, it means that the fault is not caused by the network card or network cable.
Network addresses cannot conflict.
If the IP address of ADSL modem conflicts, or the address of DNS server is set incorrectly, ADSL will be disconnected.
If you are a virtual dial-up user, you don't need to set your own IP address, just choose automatic allocation. If a fixed IP address is used, be sure to check whether the IP address conflicts with the IP addresses of other workstations in the same network segment, and also check whether the DNS address setting is correct and whether the TCP/IP parameters have changed. After these troubleshooting, if you still can't troubleshoot, you have to find the reason from the dialing software.
Tip: If you can surf the Internet normally without modifying the TCP/IP parameters, you might as well delete the TCP/IP protocol now, and then reinstall and set it correctly, which may solve your disconnection fault.
Dialing software should be stable
ADSL Internet access is mainly accomplished through virtual dialing and private line access, and most individual users use virtual dialing. This method needs the stable support of dialing software to ensure the stability of internet access. Therefore, in the case of frequent disconnection, it is necessary to check whether the dialing software settings are correct, whether the dialing software selection is correct, and whether multiple dialing softwares are installed in the system at the same time.
Tip: When choosing dialing software, you must choose according to different operating systems. For example, Windows XP has its own dialing function. EnterNet300 or WinPoET can be selected under Windows 9X system, RasPPPoE or WinPoET can be selected under Windows Me system, and EnterNet500 under Windows 2000 system is more suitable.
Pay attention to upgrading the operating system
If the disconnection phenomenon cannot be eliminated after the above investigation, it is necessary for you to check the operating system to see if it has compatibility problems with ADSL-related components.
Generally speaking, the lower the operating system version, the worse the compatibility with network components, and the more likely it is to lead to ADSL disconnection. So be sure to check whether the operating system has been patched, updated or upgraded in time and whether the virtual dialing software has been upgraded. I believe that after the investigation of these problems is completed, the ADSL drop fault will be eliminated.
I hope a little advice can help you.