I had one time that Carplay 13.1 didn't work. Of course it was the one time my wife was in the truck and plugged her phone into the other USB in the front hub. I pulled over three times, turned off truck, open door (make sure power off) and nothing. After letting the truck sit for a few hours, it has worked everytime. Also wife is using the power plug in the armrest vs the front USB hub.
I already had the front USB hub replaced for bad connections. But did notice per the part number change it has had many versions already, Curious if the front hub is having issues with two carplay ports. The rear hub only has one port allowed to go hook up to carplay.