FPS drops and persistent desync symbol after several matches

Hi. I also had some issues yesterday with that desync icon, for 2-3 games in a row it kept popping up even tho the connection was good and stable, but performance was still ok, no fps drops. 

And 2 times in other games where that icon didn't even showed up i had a bad delay where i shot a dude , he died and after 2-3 sec i was moved back and actually he killed me... i checked the connection and again everything was fine, no lag,no latency, no packet losses, that was very strange.