I had similar problems even while connected directly to the router (no WIFI), so I called the ISP. They tried very hard, even replaced the underground wiring from their box outside the house to the next point after confirmiong the wires from their box to the house was fine. I fixed the problem by reinstalling Windows on four laptops which means I still do not know what caused it.
There is a suggestion as mentioned by vadriaan that the elec wiring to the sockets might need to be looked at and may be causing the problem or interference from other electrical equipment mobile phone chargers plugged into the local elec circuit.
i am a student of diploma in electronics and telecomm
can anyone suggest me projects related to the below domains:-
electrical and electronics