This is a very different question and sure much difficult one?

I and my wife have a mobile phone each. It is very common but what as is very uncommon is we use for video talk (sign language) trough USMT net. We have a serious problem. What happen when we are home is we lost our USMT coverage. Now I have ponder over if my 4 computers, 2 screens, modem, router, Nova Wiew switch, printer, scanner and 5 adapters together or separately can cause interference so we lost our coverage. We can’t call out nor receive a call. But it goes in waves. Some day it works another day not and it can be so many days in a row.
Only when we are on another place our mobile phones works as they are used for.

What do you guys think? It is possible or not?