Swimpure Plus stops generating

Need help to understand operation?
I replaced circuit board on Swimpure Plus SWG three weeks ago under warranty because of current limitor problem.
My problem now is when unit starts it generates for about an hour then stops. I've checked cell for build-up and is clean.
If I turn it off and back on it generates for an hour or two then stops again. If I turn up desire output it will start generating.
Maybe I just don't understand the operation, I determine generating by voltage and current output. Am I not understanding operation?
I have 32k gal, plaster, DE, IG, with Hayward Ecostar VS pump,
Chemistry
2 FC
7.8 PH
120 TA
120 CH
60 CYA
72 Water Temp
3200 ppm salt
 
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