When mine (2008) does this it means it's forgotten it's programmed positions and needs to be re-programmed.
I've attached the manual for mine - I'm not sure if your's is similar...
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2008 Phaeton 36QSH, Safe-t-Plus, Quadra Bigfoot
2017 Jeep Cherokee Trailhawk w/ flat tow wiring mod.
Blue ox, BrakeMaster + BrakeAway, diode lights and charge.
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