Newbie in the forum....
I have a Blackberry 7510
that continually (at least daily) has been freezing and powering itself off.
When it powers itself off, I have to remove the battery and leave it out for at least 5 minutes or it will not power back up. It flashes the tiny red light on the top of the unit once, then 3 times fast when this occurs.
I did manage to catch an error that looked like it said "Sleep - DSP did not power off" and had a Reset bar in the middle of the screen.
Anyone have any ideas? If I don't get this fixed soon, I'm going to use it as a doorstop and get a phone that works.