There are many causes for the changing of digital devices due to interference. In an entire house, many devices are regularly used. They will definitely cause disturbance. There are some cases the setup of Wavlink Router is wrong. Some examples of wireless devices are satellites and electronic equipment in which cell towers are among the so-called culprits of the signal. Mostly, devices like these face interference because they have similar frequency ranges with that of extender setup. The same frequency range exists for Bluetooth devices. This is definitely one reason behind interference. They are as good as Bluetooth devices, microwave ovens, and many more that usually utilize the same frequency range. 

2.4 GHz frequency range. 

Thus, overlapping occurs and only WiFi interference will occur. It can probably be connected to the 5GHz band because this is very less congested from the other channels. Like on the Wavlink router setup. Local or normal connection speed permits internet congestion. This results in the slow speed of the internet. This also usually occurs during peak times when connecting to users. Besides, when you are connected to your corporate network and using a proxy server then Internet speed performance can be affected. Most network users will tend to complain about the downloading of large files that usually take almost an hour. You may ask the administrator of the network.