Yep, know exactly what you mean, mine does the same - usually when it rains (just to be even more annoying!) haven't found the solution yet but I've just removed the fuse so it won't open at all - cheapest and dryest solution! suspect the rotary switch.
I had the exact same problem with the roof on my A4. It was like it had a mind of its own. Opening and closing on its by itself!!!!!
Took it to the dealer and they replaced the whole control unit located by the light cluster. I don't remember if this was still under warranty or they did it as part of a recall. All I know is they did not seem surprised when I reported it and immediately identified the problem and changed the control unit.
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