Problem after playing 1-2 matches

When I start the game everything is fine. The first match is perfect, smooth gameplay, no delay. But after playing the second or third match the game randomly just starts lagging, feels slow and is super delayed. The fps is normal but the game feels horrible. 
My pc specs:

ryzen 7 7800xd3

5070ti

32gb ram 6000mhz

And the game is installed on ssd.

I have contacted the support and did everything they told me like disabling overlays, clearing cache, updating drivers and windows but nothing fixes the problem. Is anyone having the same problem?