cade

Hi guys, apologies if this isn't the right forum. I recently got an A3 cabriolet a few months back and around 2 months ago the alarm started going off randomly in the night and it drained my battery and so I booked it in for a service and they installed a new boot lock and that was the end of it for a few weeks until now when it's started happening again. The general gist of it is that the car seems to think that the boot is open and that triggers the alarm every so often which drains the battery, and it seems to coincide with wet weather so I believe water must be leaking through (my boot is always a bit damp on the interior despite me drying it with a towel every so often) and triggering the alarm. For now I have bought a waterproof cover to keep on my car when I'm not using it to stop water getting through to it, but I was wondering if any others have had a similar issue and how they might have fixed it? I saw a thread here where someone had a similar problem but it was caused by their rear wipers leaking something to the locking mechanism, but since mine is a cabriolet that's not the issue for me.