I have a strange problem with my 2014 Fiesta SE. Occasionally when I turn the ignition off, the radio continues to play and nothing can be adjusted on it. You can't turn it off by hitting the on/off button, can't change station or adjust volume. My local Ford dealer suggested disconnecting the positive battery cable for a few seconds and then re-installing it to get the radio to re-set. This works. However, the problem continues and I do not know the cause or the solution. Any ideas?