Film doesnbt advance fully 503CX


Several of the films I recently put through the camera did not advance fully during the first three shots of each film so that some of those first images overlay each other (by different amounts)?

I suppose this means a trip to the repairman? How expensive will it be?

Is this problem related to my other problem: the top auxilliary shutter of my 503CX doesn't open fully, causing fogging on each frame at the bottom of each image (top of each frame of the film)? The gap between the edge of the shutter and the body is about 1cm.