Help!!! Very Urgent!!!

I WROTE SMS SERVER FOR GSM CELL PHONE.
EVERY 10 SEC IT SEARCH IN A DB FOR MESSAGES TO SEND AND WHEN FINISH IT IT LOOK FOR INCOMING MESSAGES.
SO FAR SO GOOD.
WHEN IT FINISH IT, THE SERVER GO TO SLEEP FOR 10 SEC AND THEN START ALL OVER AGAIN.
THE PROBLAM THAT AFTER SOMETIME THE SERVER GET STUCK AND NOT REALSE THE CPU.
I USED THE SLEEP FUNCTION TO AND IT DOESNT WORK.
I PUT DOEVENTS() AND IT DOESNT WORK.
WHAT TO DO?
I MUST USE SOMETING THAT WILL NOT CAPTURE THE CPU.
PLEASE HELP ME.

I WOULD HELP YOU BUT YOU JUST BLEW MY EARDRUMS OUT!!!!!!!!!! Jeesh...