Originally Posted by tsac
Unless you got it wet or dropped it the first thing to do is to replace the battery.
If you let the battery drain below 20% much it is usually what will cause this.
Well i'm pretty sure I have never got my bb wet but I have dropped it a few times. Also yesterday I noticed that my blackberry battery was bigger than usual (sort of like a big lump on the front side) which causes the back casing to not fit properly (like there is a small gap whenever i close it). So perhaps this is causing the problem?