We've also been experiencing problems with our unit. While on USB mode, the music will just stop. We will have to remove the USB stick and re-plug it for it to work again. Tried different sticks, different formats, with or without tags -- all the same. Less frequent, but still frequent enough, is the whole system will reboot (showing the "Honda Navigation System" screen). At times, music will continue in the background and will return to the music screen but, less frequently, it will be just as if it was just turned on (you need to press the "Ok" button).

I have to check with firmware version we're on.

frums, did you experience the same issues while on USB? Has your unit been behaving since?