I've been having an issue with my CPU idling crazy high and having ridiculous temperatures as well. I fastened the cooler, so it can't be loose, I 'm wondering if it's iCue now as well.
A few of the Ryzen threads with AMD I've seen they mentioned that there's an observer effect with sensors, and I'm wondering if that's what we may be seeing here. The sensors in the driver set / iCUE software waking the cores to check 'em too often.
I'll do some uninstalling as well, see if it helps and report back.