Hello,
I have the same problem with my 710 BT.
Yesterday I did some experimenting. This is what I found out:
Before I did some experimenting some songs did not work, the songs that did not work (froze the UI) were songs that I recently putted on the device. Then I did a reset of the AVIC and after I did that, ALL the songs froze the UI.
Then I formatted my USB stick and putted some tracks on it (in one folder (ROOT) AND in alphabetic order so I could recognize easy where it has gone wrong). First I putted 20 songs on it, they played flawless. Then I putted 40 songs on it, play
