Radio/Sync Problem

[engine12]

Started having a problem about a week ago with the radio, both on FM and Sirius changing stations either up or down one station or frequency and then back again on it's own. It happens when the stang is moving and sitting still. Does not seem to be anything specific causing the issue. Bumps,turning of the steering wheel, etc do not seem to cause the problem. Had the stang at the dealer today and of course they could not replicate the problem, therefore didn't do anything. Has anyone else had this problem and if so how was it corrected ?

Thanks !

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