I recently picked up a Moog Source that worked great at first, but now has very random intermittent issues with the key bed. Every so often, a key/keys will sound half a step higher, or rapidly bounce between two pitches. This does not happen when using external CV to play the synth. All key contacts have been cleaned (The keys always trigger, just not always at the right pitch)and all the 100 ohm resistors between the keys are secure and reading the correct resistance.
Here is a video of the symptoms. https://photos.app.goo.gl/XEvHiBVosfRJrYHF9
Thank you for the help!