I bought my 156 about 3 weeks ago now. The weekend before last, I took her on a 400 mile round trip, no problem and before that, no problem.
After getting back from th long trip, she was sat on the drive for a week, during which I checked the connection to the driver's door speaker as it cut out now and again - popped the speaker out, checked everything was ok, cleaned the connector and put everything back.
When I next tried to use her, she was dead - no central locking, nothing! I connected a 12v charger to the battery and it was pulling through a high charge, so I left it charging for 24hours. On Sunday, she started fine and we went for an afternoon spin.
Went to replace the front grill yesterday, and she's dead again, although this time there is no central locking, but some electrical life when I turn the ignition. Won't turn over though.
I guess there must be a battery drain.