Endurance computer goes haywire, then begins working again.
Was the bike or quad being washed, going through a stream, traveling in a rainstorm, etc? Water is a great conductor, and if the contacts between the Endurance docking station and the computer base get wet, erroneous data will be the result until they dry off.
There is water or condensation inside Endurance computer.
Was the machine washed with a pressure washer or driven home in the rain with the quad or bike in the back of an open pickup truck? High pressure water forced against the front of the computer will eventually wick inside.