I got a cgminer dump and auto-restart as well (it ran very nicely, for 9 hours, at 3.585 Ths and 50080 WU).
I'm going to assume it was not possibly VRM temp related in your case.
I still have a couple that reach low 90 on occasion.
Those are still just sitting in some wind.
I mention that because it is certainly 'possible' that they got warmer I doubt it.
Some kind of clue is output from
cat /var/log/monitordcdc.log
It shows throttling of all die(on one ASIC) and documents cgminer restarts indirectly.
The timestamps have big jumps at 'events'.
Been runnin clean for a few hours now.
Pool thinks it did 3.7T for an hour!
3.600 would be perfect @ 500 and I had 2 die(or 6???) slower at the time.
It's just a calculating average wierdness when block times change during period averaged.
Still pool is not indicating anything to get alarmed about.
I'm just lettin it ride. It recoveres quickly.
YMMV
I just woke up, and saw that cgminer 4.4.1 dumped again (and restarted automatically)... looks that there is some bug in fw-1.0 or cgminer_4.4.1 (I didn't have crashes with rc9 and 4.4.0, while hardware and Volt-tuning are all the same).
Next week, I hope to have some more time and will check that log-file (thanks for the info).