Sometimes my TP2 won't turn on !

[WARMACHN]

I notice that when am using my earpiece and the phone turns of the backlight off its won't turn back on.. I know its just the backlight bcuz if I press the lef key it dials the last person I was talking too. But It won't turn on the back lights I have to soft reset everytime it does that.

Beside slamming the phone on the Floor J/K does anyone have any suggestions..

Update 11/06/09
OK I fixed mines!!! It was the battery! I notice it was kind of loose so I did a home remedy mad getto LOL put a piece of paper to hold it tight in place and Ive had no problem since... its been now 4 days with no issue. Am still taking it back to sprint but since I did this Ive had no problems.