Glad to see that my intuition was running on high. I too had my screen go black the other day and not come back on till I stopped and restarted twice. I too had my USB drive being used (while charging my Bluetooth earpiece) and running my iPhone on Bluetooth at the same time.
I immediately called my dealer since we just purchased the jeep the day before and had read about some troubles with the screen online. I haven't had the issue since and told the dealer I thought it had something to do with running the USB at the same time the Bluetooth for my phone running.
All my steering wheel buttons worked and I still heard the sound from phone but there was no screen. It glitched a little after that the next day but has worked great since.
Now that I have read others with this combo (USB and Bluetooth running) and screen going out might have something to it. I am hoping they can pinpoint what this is all about. Since I haven't run both since, I haven't had any problems but will be running the new 5-22 update today and hoping nothing else comes up.
We traded in our 2011 Overland v8 for the new 2014 Overland v8 and love the improvements so much so far!!! The things that bugged me about the 11 are improved in the 14 and I think are worth it so far except for Uconnect and screen issues. After these get taken care of it will be great!!! I have had Ford Explorer, Honda, MDX and Hummer before the 2011 GC Overland and now the 2014 GC Overland and it is one amazing vehicle. I love it 95% so far and when the screen gets figured out it will be 99.9%. The one percent is just that it doesn't drive itself while I nap.