You might have an oxidation build up on the metal contacts that could be a DIY fix. Buy a can of electronic cleaner, and spray it into the small opening using the included small straw, either above or along the edge of the wheel. Remove the battery and memory card first. After spraying 2 short bursts, move the wheel rapidly in both directions for at least 20 seconds to allow the cleaner to work, then let it sit for about 30 minutes to evaporate. That has solved several issues in the past with other electronic gear, particularly, vcr's & also, windshield wiper motors.
Jim