Phone hardresetting itself

[sheltem]

My phone has hardreset itself 3 times in the past month. There seems to be no pattern involved. The first time, it happened during a scheduled backup run by SPB backup. I can't remember what happened the second time, but the third time it happened after my phone battery died.

I also have an issue where if I don't put my phone on charger overnight, it drains the battery completely. This has been happening for a couple of months. I have my push email set to check emails every 2 hours during offpeak (12 am - 9 am). Because my phone uses ROM, isn't it supposed to retain its contents when the battery is drained?