1. System setting problem: the time setting in cloud mirror may need to be adjusted manually, especially after a period of use, some cloud mirror time may be deviated due to time zone setting, time synchronization and other reasons.
2. Network problem: Cloud mirror of time may need to get updates from the network. If cloud mirror can't connect to the Internet, or the network is abnormal, the time update may fail.
3. Hardware failure: Older cloud mirror equipment may have hardware failure, such as insufficient battery power and power adapter failure, which will cause the time not to be updated normally.