pfloyd57,
that can only happen if there is an issue with some of the cables or connectors. If the lead is a short one, if you follow the instructions and all connections are stable, then the charge process must be stable, too.
I would check what happens if you push or hold sidewards your power supply connector, which is going inside the charger box.
We had a couple of guys here in Germany and UK that did not use the proper connectors for the power supply, they were a bit too small, which resulted in intermitent charge performance.
Only by pushing and holding these connectors sidewards made charging possible.....
Tronical
You play. We tune.