I hit a pothole last night (followed a nice paceline right through it). Blew my front tire and my PT head went sliding down the road. No visible damage. Unit worked fine the rest of the night. Today, when I turned it on and "woke" the hub the unit displayed 7mph when at rest even after I zeroed the torque and cleared the data. The entire ride it displayed 7mph, 21mph, 27mph but no other speeds. It would occasionally display broken numbers or dashes. Watts and time worked fine. I've cleaned the contacts. Any other thoughts? TIA.