Flat Oot like a ducks Foot
Do you power hose your car? I'll bet thats the problem.
You need to replace the switches in the lid. Water gets in to the connectors & fries them causing them to short out.
If you go to Audi, they sell them as a kit as I recall as you may need to cut back the wires & re solder new ends on them depending on how bad the corrosion is. Not a big job, just fiddly to get the switches out.
When it comes to re-fitting, give them a good coat of silicone grease to keep the water out in future.