This sounds almost entirely like a CPS, especially if it's temperature related.

The loss of power could be related to the CPS or if the car is an SRT it could be the IC water pump. I'd replace the CPS first - the part shouldn't be too far off $100 and it's an easy job.

https://www.crossfireforum.org/forum...on-sensor.html has a very complete guide to the CPS if you read through the thread.

On the flip side, generally when the CPS fails the car throws a Check Engine code which the dealer should have been able to read. I'd take it to an auto parts store and ask to use their code scanner (at most places it's free) and see if any are present.

There's also the "mystery no-start" which is related to the Relay Control Module and doesn't throw a code, but this doesn't really sound like your issue - check this last if nothing else is working.