Front door panel sticks

[gvanzant1]

A few weeks ago, the front left door panel (driver's side) started sticking on my S70. It seems to be catching on the trim between the door and the driver's seat at the bottom of the door (where the trim curves up near the seat belt floor panel). Over the past few weeks, the sticking has even pulled the panel lose at the bottom of the door. A visual inspection does not show any sagging in the door itself nor in the door panel. I also don't see where the interior door trim has come loose. Any suggestions?

George
1998 S70 (non-turbo).