1 . Signal interference Reason: there may be strong signal interference sources such as microwave oven, cordless telephone, magnet and high-voltage line next to the router. Radio signals and strong magnetic fields from these devices seriously affect the normal transmission and reception of WiFi signals in routers. Solution: turn off these devices or install the router where there is less interference. 2 . Router firmware problem Cause: if the firmware version of the router is too low or the f...