Check the brakelight switch before you do anything else.
Remember, the Prodigy line of controllers are designed to help you hold the rig at a stop. After the controller no longer senses deceleration (once stopped), but you continue to hold the brakes (which is senses by the brakelight switch), it will automatically send at least 25% of max-set braking, regardless of how hard you are pressing the brake pedal, which is enough to hold the rig still in most cases.
So, if the brake switch is intermittently going bad, and stays lit even when you release the pedal, the Prodigy thinks you still have your foot on the brake, and will remain in "Hold" mode. Once you tap the pedal, and the switch finally lets go, so does the brake controller.
Replace the brake switch, or check to see if something has come loose and needs adjusted (?).
thebrakeman ('70), DW ('71), DD ('99), DD ('01), DD ('05)
2004 Surveyor SV261T (UltraLite Bunkhouse Hybrid)
2006 Mercury Mountaineer V8 AWD Premier
Equal-i-zer WDH (10k), Prodigy Brake Controller