I have a 1996 E320, 87000 miles and a 4-speed electronic box with the following problem. Invariably (95 times out of 100) when the car has been standing for a couple of hours or more, upon starting the engine and driving away, the box will not change from 2nd to 3rd until I hit about 3,200 revs. Then it will change from 2nd to 3rd to 4th in instant sequence. Thereafter, the gear change is as one would expect. At all times, the shift up or down is smooth and there are no untoward noises coming from the transmission. The box was serviced a couple of months ago (oil & filter change). In addition, no fault was reported by a diagnostic computer. Any ideas / clues would be greatly appreciated. Thanks.