Wi-fi on my Ubuntu KDE "crashes".

It works normally with everything set-up, when I finally notice that pages don't load or that video stopped buffering. After that, I go to Wi-Fi window, and it says 0kb/s up and 0kb/s down.

There is no real time, it happens randomly without me doing anything new. This happens only on this machine and only on Ubuntu. No other device does same 
and Windows on the same machine, doesn't "crash" either.

When I leave it like that, my entire list of potential Wi-Fi networks get emptied with only this single network being accessible. When I try to disconnect it takes more time than it should (couple more seconds). When trying reconnecting I get messages like "Cannot connect to network" and "Cannot find interface" or something alike to this. Essentially it goes terribly.

The only way to "restore" wi-fi is to restart entire machine. And Ubuntu doesn't any crashing.

Because rebooting for single command or action would be inefficient. If you have more than one suggestion or need information from more than one command, could you just them? So I can execute more than one command?