Was just the left door for a long time, one pilot who has been here since aircraft was new said it was always a little odd but never as bad as is now or has been for the last few years. The right door is now just as bad after the mechanic tried to make an adjustment to fix a grinding noise but loosened up the wrong bit and of course couldn't get it back where it was. Based on that I'm sure it's just an alignment and adjustment problem, the issue is we cannot seem to find the right technique. It feels like the door is too far forward or back and it tries to push itself when it enters the curved part of the track as it goes into the airframe opening. The primary adjust problem area are the two bolts under the cover on the middle roller that bolts to the middle of the door. The manual gives no help other than "adjust the door till it works with a 5mm gap" If I could watch how them put these on the aircraft on the assembly line just once I'm sure everything would make sense but that's obviously impossible being in the USA. Gaskets are ok and still original, its a binding on the curved part of the track that the door just wants to pop back out.