This just happened to mine 2 days ago, and I have never updated the radio. Just happened for no apparent reason. Before it would almost always default to the last source used. Sometimes it would fail to default back to the flash drive and would default to XM. I'm mostly on the flash drive, sometimes XM. Never the radio.
Now, most of the time when I start the bike it defaults to the lowest AM station. It got so annoying I tried shutting it off but it still tried to default to AM when restarting the bike.
Bluetooth streaming has never worked reliably. I think I got it to pair once back when I first got the bike. When I go to media, my iPhone shows up on the list. When I select it, it displays "Waiting to connect". If I open Bluetooth on the iPhone, the bike does not appear as an available device.
If it were not for the nav feature I would have ditched this POS radio.