It sounds like a problem with the shift solenoids. They will let the clutches slip after a while if they do not shift positively or can cause damage under a hard shift.
The best thing to do is to change the fluid and filter and see if that helps. Otherwise, you may need to find out which solenoid is bad, replace it and hope no damage was done that would warrant a rebuild.
Wednesday, December 7th, 2011 AT 10:54 AM