When WiFi suddenly disconnects, it may be due to unstable network signals, router failure or other interfering factors. Removing the network cable to measure the speed and take photos may be to record the status of the network connection for later troubleshooting.
The speed measurement can check whether the network speed is normal, and the photo can be used as evidence to help users explain the problem to the network service provider or technical support personnel. At the same time, this can also help users better understand the stability of the network connection and possible problems.
Which means someone got into your router and assigned the broadband speed limit. The solution is to enter the route yourself, change it back, and then modify the router password, generally many people use the default password, it is easy to be cracked.