Hello everyone

have recently been a strange problem with my window lifter (audi a8 bj 1995). When I start the car, my window lifters do not work (all) or. has no current. you notice on the keys there no lighting. But after a few minutes approx. 5 min everything goes back until I turn off and remove keys. At first, it was. But now it's a little different. say, after a few minutes I see that the touch light is there, but when I press it, the whole thing goes out immediately. after a few minutes everything goes back and works perfectly. Of course, when I turn off and pull off keys, the whole thing starts over again.

so break the cable etc it is certainly not. window lifter controller? Relais? What can it be?