Input freeze

Since the quad mode update, the game starts to randomly freeze for a brief moment. During the freeze, fps drops to about 20, and new inputs are not accepted, the character would continue to move/fire according to the input at the time of freeze, but not turning around. Sometimes the input is delayed, if I press keys during the freeze, the game character will perform the action after 1 or 2 seconds.

I don't know if it's related, but since the update I noticed that "spot shadow detail" is causing more performance issues. It was set to very high before and there was no problem, but now I experience severe stuttering with it. Also, the game process is generating about 20 handles per second when idle, it can generate 6000 handles in one minute when I am in a game session, including training ground. I have a screenshot of the process with over 400k handles.

When the input freeze happens, CPU load is not full, about 60% just like usual. GPU load however drops significantly when stuttering happens. Temps are normal, and other games are working fine. Reinstalling the game does not solve the problem, drivers are up to date.