Severe hub CPU load detected

C8 Pro Latest sw ....This keeps happening every other day or so. I can't seem to connect this to any rules. In the main log, I don't see any activity. I find it a bit strange that this shows up in the "location log" since there are no location change that I can discern. This time it started happening mid-morning. The last time it was around 4AM. My point is there really should not be a location activity change. It repeats multiple time ALWAYS at almost exactly 5-minute intervals. I don't have any repeat or "do while" rules set up. (other than one for if doors are left open for too long) Any suggestion for how I can track this down?