thermostat sticking

Hello all, I hate to make another thread about this but I am stumped. So I’ve been having a heck of a time diagnosing my coolant issues the last few weeks. Originally, I had a radiator fan relay circuit/ ECT code, which I fixed but now I seem to be stuck with this “thermostat inactive code”...

This is an interesting one. Recently had a camshaft replaced on the Jeep. Outdoor Temperatures dropped and a P1281 code was triggered. Odd because 2 years ago I put in a new 195-degree Carquest Premium Thermostat. Anyway, check out what I saw when I took off the housing. Some sort of plastic...

Ok all you cooling system wizards. What would cause a thermostat to lock open? I’m on my third Stant 195 now and befuddled.

Prior to our Colorado trip I flushed my coolant and installed a new stant thermostat, temperature sender and cap. We drove the tj over 1000 miles to SW Colorado without issue. We have ran over 500 miles jeeping. Yesterday Morning I went to town and after about 5 miles I had an eng light. I...