wifi crashes

MacBookPro early 2015 WiFi just stucks/crashes every few minutes and it drives me crazy. Previously it wasn’t so often. It also happens on MacBook Air mid 2011. It doesn’t matter on the router, it happens everywhere.

I need to turn off and then back on wifi on computer and it fixes for another few minutes. I've tried all thing I can find on internet - doesn't work.

PLEASE show me a fix, it drives me crazy.