Internet speed

Hi I didn't know where to post this
my internet speed been groin crazy
its goes fine then at some point all the speed drop the lights flickers
only in wifi tho
I called my ISP they said it the signals from the wireless phone
called my friend he says its signals from other routers * I live in a building around 16 ap 4 per floor*
both said to connect via either
a lot of my usage is by phone so I use wifi
any one have any solution for it ?
 
Eliminate the possibilities.

Turn off the wifi, connect to router via cable only. Is it still slowing down? If yes, it's something related to wireless. Then continue troubleshooting.
 
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