Updated to 4.22, renders now are grainy.

Hey all, I've been Googling and trying to solve this issue for the past two days to no aval. After updating, renders are now grainy despite scenes prievously coming out fine. I haven't changed any settings or lights, my drivers are up to date.

Below are an example of before and after from the same scene. I would appreciate any insight or advice to get the program back to producing usable content. Thanks!