Sliding roof. Go, go, go

Hey, guys.
I've been having the little problem for a while (not bothering me) but I'm really curious and like to learn about it....

So, my sliding roof operation on the roof (should be a red-lit switch) goes on for some time, then goes off again, goes on for a few seconds, then works again for minutes, etc. (When ignition is switched on, of course, wg. Radio)
Is really interesting to observe in the long term, only in the long term the concentration is a little difficult if on the passenger seat sits a hollow, cute femininity and one can not look and dream together in the clear starry sky, but is fascinated by this strange function of the switch...
I can't make a meaningful rhyme on it either, because it can't actually be a wobble contact or something like that, can it?
The function of the roof is impeccable.

Welcome
Frank

There can be no more than one!