2004 V70 2.5T with 33000 miles. While moving from a stop, auto transmission occasionally slips as it shifts from 2d to 3d while in the 2000 RPM range. Engine RPM accels to 3000-3300 before slip stops and 3d is engaged. Slip lasts for approx .5 seconds. Problem just started at 32500 miles. Since it is an intermittent occurrence, I doubt my Volvo dealer will say I have a problem. Any ideas as to what the problem might be?