The lock at the driver side door has been acting strange. Basically I
can't lock it by any means from outside: can't lock by key, can't lock
it by power master switch and can't lock it by the inside manual lock
tab either. And when I push the inside manual lock tab, I feel that it
doesn't move much  as if it is stuck somewhere. One more funny twist is

that sometimes after driving a bit, the driver side door seems suddenly

to wake up and being locked automatically and I can't opened it. At
that time, I might unlock it by pushing/pulling the inside power master

swtich repeatedly and after a few times, I might then open the door. At

times it doesn't work, then I have to get out of the car from the
passenger side door, walk around and strangely I can open the driver
side door easily by simply pulling the outside door handle (if that it
means it is not locked, right?! but I can't open it from inside by
pulling the inside door handle). Anyway, seems to me it is all messed
up. When you are inside, it can lock you up and when you go outside,
you can't lock it. There is also a minor issue with the passenger side
door. When I pull the inside door handle to open the door, the inside
door handle can't go back to its original position automatically. I
have to push it firmly back to its original location. Compared to the
driver side door, this issue is minor. Any ideas how to fix the door
problems?