I take it you mean the door release mounted externally in top of door ? It could be due to the linkages inside the door not functioning properly or simply the latch mechanism in trailing edges of the door needs lubricating . Remove the door cards to access the internal linkages and the recessed door release / grab handle . There is a spring inside the handle / release chromed cup . Removing the whole assembly is do able but very fiddly because of restricted access to the two locating nuts and bolts . Especially the rear ones of the two.