Mogul stuck on black screen

[f1n3st]

Hi my mogul has been randomly dieing on me lately, i would turn it on and call someone talk and hang up, then 2 minutes later i would try to turn it back on through the power button because it hibernates or something and it just wont let me, i would have to take out the battery and put it back in, i cant even press the reset button or anything. i dont understand! thank you in advance for any replys!

oh yea, i know the phone is on because i see the lights flashing, but when i try to call it rings but thats it, it doesnt even show up as a missing call when i take out the battery and put it back in.