Why does the system crash immediately after re-booting?

[AC Question]

Why does the system crash immediately after re-booting

The battery ran down - faster than usual - and when I plugged it into the power it needed re-booting. The whirling dots appeared and then the usual home screen. It then crashed.

 

[B. Diddy]

Re: Why does the system crash immediately after re-booting

Welcome to Android Central! Which device?