A4 1.8t Convertible '54 plate, 37k

Recently I have been having a few problems that I suspect might be the Multitronic gearbox. Sometimes, at low speeds or stationary I put my foot down (not agressively) and the car does not move but the revs slowly climb. It's as if I've selected neutral except the revs only climb slowly instead of rapidly.

Also, sometimes when coasting the car seems to stuck get stuck in a low gear, i.e 2nd when rolling downhill at say 40mph. I have to knock it into semi-auto and change it to 4th.

Anyone else had this? I've read a few horror stories regarding these gearboxes and I'm beginning to panic!!

 

Surely someone else must have had this gear slipping problem?