I would check that the camera lens is clean - the first thing that came to my mind when viewing your example was 'fingerprint'. The design of the XA makes it very hard to keep fingers off the lens.
The next cause of blah color prints is underexposed negatives. Compare the negatives from the blah roll to the good roll - if the blah negatives are thin then the camera may have been set for 400 speed while loaded with 100.
Low contrast can be a result of the camera (or film) sitting in the hot sun or a car glove compartment.
The very, very, very, very last things I would expect to be the cause are that the manufacturer can't produce film or that Kodak can't develop it. Switching labs or films won't fix the problem.