Process randomly freezes

I’m playing the game on high settings and for 2 yrs it has never stopped working like this. Recently the game started freezing mid game, sometimes during collection browse, team fights, sometimes when I access hotkey settings mid game. It freezes the screen so I alt tab into Task manager, it says hots is not responding but the memory MB is picking up at like 1.5 mb/sec. When it freezes and drops it’s usually on 940 MB, then by 1100 MB it unpauses and takes me through the rejoining process, making me not present for about 5-7 minutes of gameplay. Is this a common issue with recent patch? Problem with my PC?