Had this problem before while updating the versions. I’m at 3.2.2 now and is pretty stable but not the first couple playbacks of any sizable project. I’ve watched it happen in the task manager performance screen and resource monitor. Seems to coincide with disk page buffering or something maybe?
I hear a glitch, then see the peak on the graph go by. I’ve tried everything I can think of like making the disk read area larger, higher priorities on functions and such but nothing seems to help. It seems like the program has to “warm up” first?