That's an interesting symptom. The first TT also an X23B, our stereo, not an IRV but a Jensen, did something very similar. The dealer was a long drive. I called Jayco, and explained the prob. They wanted the dealer to see it and I "whined" about the trip. In the end they sent the replacement stereo directly to me and I installed. They paid to ship the bad one back too.
Your stereo sounds defective, certainly a warranty issue (if you are the original owner and in the 2 yr warranty).
2013 F-350 CC SB 2WD 6.7PS
2013 Eagle Premier 351 RLTS
-SOLD- 2012 X23B
-SOLD- 2003 Ford Expedition 5.4, Bilstein shocks