2) If it's a router problem, if it worked before, it won't work for the time being. My own way is to disconnect the power of the router and plug it in. See you later. If yes, you can restore the factory settings and start using them from the new settings (this is sometimes caused by the slow or failed IP address search of the router under the premise of correct physical connection, not the router is broken).
If I can't solve it all the time, I suggest calling the customer service of the router. They have telephone online guidance. If I encounter problems that I can't solve, it is very useful to ask their advice. They will provide correct advice for your setup or operation.
3) If the wireless switch is off, just turn it on. If it is a software wireless connection, the software is not easy to use, and it is normal to have problems frequently. There is no better way to use a router. In addition, the network card driver is not suitable or not suitable, and there is something wrong with the network cable interface or network cable.
4) If it is caused by system problems, it is recommended to restore the system or reinstall it.
If Win 10 is immature:
Win 10 in the testing stage, Microsoft is eager to let you experience it just to help you test the system. There is nothing you can do if there is a problem. The problem of the system itself is to be solved by Microsoft experts, not by you and me. If it doesn't work smoothly, it will often cause problems. It is recommended to switch back to the original system and use it when it is mature.