I have been through the buying spree, buying another camera when the one on hand doesn't work as it should. Today I feel that it is false economy - how would you know the next camera works okay? The only reasonable way (as I see it, YMMV) is to get a CLA for the camera in hand. My own camera was CLA'd 4 years ago and is still ticking along.
As a bonus, my negatives are more evenly exposed and I know the mistakes are on me and not because of a possibly malfunctioning camera.