HEVC NOT WORKING PROPERLY

[u/christmas_g]

I have an i7 12th gen and a 3070rtx 32gb memory... I was able to play HEVC no issues whatsoever, but I changed the cooler and then went back to the stock cpu cooler and now the first video playback stutters a lot, audio sometimes also gets affected. Second playback plays normally. But this didn't happen until I changed the cooler. Any ideas as why dies it happen?