I've had my Edge 530 for 5 rides. On 3 of the rides the speed and distance and/or cadence cut out anywhere from 10 - 20 miles into the ride (showd "0 mph and distance did not increase). I could not get the recording to start up by powering off. One one ride the speed and distance started to record again "on it's own" after about 15 minutes of riding. When I uploaded the ride at home, the map showed the entire 55 mile route, but only recorded a total of 34 miles. This is frustrating. Thoughts?