so this is my 2nd blackberry pearl 8130 from Alltel and both have ended up doing this

I KNOW THE RADIO SHUTS OFF WHEN THE BATTERY IS LOW! THIS IS NOT THE SITUATION

my blackberry's radio keeps shutting off...i go to turn it on in the "manage connections" icon in the menu
and then in a matter of seconds it shuts off again


is there a way to fix this? im probably going saturday to get a new one on warranty of insurance but i was wondering if anyone knew how to fix this?ra