Phone bluetooth connections get removed after being paired
I have a 2018 Pacifica 8.4 display without navigation. Phones are Moto G5's
When I first picked up the van from the dealer new a few months ago the time was off by 4 hours and could not be changed. The dealer replace the radio which fixed that problem. But I immediately noticed that the van would no longer retain the Bluetooth paired phones after about an hour. I never noticed this condition with the original radio. Here is what happens. Our phones pair fine. If I turn off the car for less than an hour, the phones reconnect fine. If the engine is off for more than an hour and then start the car I get a message on Uconnect that no devices are available. Uconnect does not list my phone as being previously paired. And the weird thing is that our phones have the connections removed too.
I was able to talk the dealer into replacing the radio again, but that did not fix the problem. Any ideas, similar problems?