1.Insufficient processing capabilities problem: 5g router with sim card itself is a small computer, which has its own CPU, memory and operating system, its task is to forward data frames. When you connect too many devices beyond its processing capabilities, it will cause network congestion which can be solved after restarting.

2.Quality of 5g router with sim card itself has problem: Many friends reported that after 1-2 years of use, they found that their 5g router with sim card responded slowly, this may be due to the aging of the electronic components. In some cases, poor heat dissipation will cause the CPU which is the main component to become slow, or the Flash runs for long time to cause an increase in bad blocks.

3.Network congestion problem: A certain device in the LAN takes up too much bandwidth due to some reason such as crazy downloading or poisoning etc.. For wireless network, since 2.4G has only 13 channels and there will be channel interference, they will interfere with each other and cause a poor network if there are too many surrounding wireless signals, and these problems may be solved by restarting.