thermalmonitord — Watchdog: stuck process
thermalmonitord did not respond, but the log lists no “Missing sensor(s)”. The iFixit wiki states that in this specific case (no sensor named) it is generally a software problem.
iPhone
Probably software (no missing sensor listed)
Low confidenceVerified sourceWatchdog: stuck process
First check
Check that no “Missing sensor(s)” line appears further down in the log; if confirmed, update / restore iOS before any part.