I have had a couple of strange problems and I can't really make sense of it. When I parked the car, I locked the doors as always with the windows closed (I am absolutely sure about this; it was freezing cold outside). When I came back, the car was still locked, but the front windows were down. I immediately checked whether anything was stolen, but that was not the case and there were also no signs of forced entry. When I wanted to start the car, I had a left rear light warning, but all rear lights (brake light and indicators included) still worked perfectly. 5 minutes later, the warning went away, only to come back on when I started the car the next time (it's still active now). Does anyone have any ideas what the problem might be?
Perhaps I should also mention that I have had some 'mild' engine problems with, what I believe to be irregular fuel injection (which I have already addressed by this time and it seems to have helped), but I cannot see how this engine problem could be related to windows coming down on their own and a faulty rear light warning, which is more electronics related.