We’ve seen messages like this in the past. One place that can cause this is the use of a lot of MWI and “hints” processed on the machine. Phones Lagged and Unreachable is an example. PJSIP Become unresponsive is one in PJ-SIP. If you search for “scheduled tasks” in the search icon (top of screen) you’ll find lots of pointers on ways this has been solved for other problems. While yours isn’t exactly the same, it could be something similar.