Car has been parked in garage. Went out this morning and the doors were locked. Window was down and was able to unlock with key. Opened and closed door. Returned in an hour and doors locked again.
'06 Coupe with 167000 miles

 

so the car is locking itself?

 

It will lock if keys are removed from ignition.

 

you mean unlock? dont think my car has ever locked itself...

 

If I remember correctly (been a while) I believe that was an option. I could be wrong though....

If the window dropped on its own, there is a possibility that battery is toast and needs to be replaced.

The only other possibility is that the BC1 has been water soaked and is corroding.