[cadauctions]

Sounds like the bands, or something of that nature. Check the fluid and smell it for a burnt smell. If it is turning a darkish brown, then get it in for a fluid flush. You should have this done around 30,000 miles anyway so you are most likey either low of fluid or the fluid has lost it's anti-glazing minerals, and needs some fresh fluid. This will most likely cause problems when the car is cold because the fluid has not expanded yet.