Windows & sunroof problem!

[Joe 90]

I hope someone can help me with this one....

When I try to lower my driver's side window, Nothing moves and I hear some buzzing noise coming from the switch. It doesn't happen all the time (so it’s not the fuse), some times everything is fine!!! When it happens though, I noticed that the same "noise" also comes from the sunroof switch when I try to open it and it doesn't move or verrrry slowly..... Like if there was not enough voltage.....

I suspect a bad ground.... Does anybody knows if the windows and sunroof share the same grounding point? If yes, where it? Or could it be the battery ground? Any other ideas?

I need help my roof is half open (or half closed !)
Thanks

Joe 90