I've been having this problem with the past week's current builds - so maybe the new processor boost feature has something to do with it?
Anyway - whenever I play an audio directory or album on my iRiver H10 6 GB, it crashes after anwhere from 5 to 15 minutes of playback. I end up having to remove the battery, put the battery back in place, and then the player works fine again.
At first I thought it was something to do with the backlight. It was crashing frequently after I had the LCD backlight set to "30 sec" and music would be playing. So I turned the LCD setting to "on", sacrificing battery life, but still with hope that the player wouldn't die during audio playback.
Well, 5 minutes ago it died just like it would do when the backlight was off, but since the backlight was on, I got an error message!
It read (among various pink splotches all across the "Now Playing" screen):
"Undefined instruction at 0059220"
No clue what that means, but hopefully you can address this in future updates.