2024 freightliner m2 radio shuts off every hour

We have two freightliner m2s in fleet 2022/2024 where the radio shuts off every hour exactly with truck running. The dealer says they have never heard of this, I find it hard to believe that our company could have the only two that do this. I've tried messing with the radios to see if there's a timer shutting it down but can't find anything. Hoping one of you fine folks might have a solution to our problem.