The radio in my 2009 Hyundai Tucson completely shuts off sometimes and other times the volume just fades away so when turns up all the way it’s like level 3. It’s all very intermittent. Sometimes it’s works fine for the whole day and sometimes varying amounts of time. The radio is just the single CD player, am, fm. I thought at first it was the app but like I said sometimes the radio just completely shuts down. Perhaps 2 different problems.
Sounds like an internal fault in the head unit, not a loss of battery power to the whole thing.