led from the driver´s door remains ON

Hi all,
I have a problem with my golf 5 (2007): the led from the driver´s door remains ON after locking the car ( no matter if with the remote or with the key). Only after approximately 10 minutes start to blink normally. I checked more times and all the doors are properly closed and cleaned, but the led remain ON instead of blinking regularly. Can anyone help with this annoying issue?
And another aspect: When it worked "normally", even if I keep one door open and press lock on the remote, the led started to blink like everything was properly closed. Can be a fuse or something else should be checked?
Thanks