dude!
last night it did the same thing, but this time it wouldnt boot back up! it would just recycle through this black screen and white screen with light and quick vibrate.

i removed the battery, sim.... inserted charger.. nothing! it was DEAD

so, i used the cable and did the software update from SE site.. and it worked. it turned back up.

my Firmware is old i think, im not sure how to update firmware.