Aqua Rite Shutting off and on - Maybe a Cell Voltage issue ?

My Hayward Aqua Rite is cycling on and off. My Diagnostic Display for Cell Voltage seems to be an issue. It will rise to about 19.6 and at that point the unit powers off. It drops to .9 then rises to 17 before the unit powers back on. It hits 19.6 and turns off. I found this YouTube video that shows what is happening. This is not me but someone else with the same problem.

https://www.youtube.com/watch?v=vrkiRV9zWEo

Any help would be appreciated. The unit was purchased in Feb 2012. It has the original cell. The software version is 1.58. Cell type is T-15. My cell current is reading zero which is assume is not good. My water temp is also not reading correctly. It says 34 and it's much hotter than that.

Thanks,
Jeff