You should check your manual, but I'd guess 57 degrees is at the low end of the operational range. Two things kill SWCG units: operating hours AND operating at low temps.
It's possible that your unit is saving your a## by not letting the unit run, unless you force it by "super-chlorinating". But I don't know for sure.
Regardless, below 70 degrees water temp, you'd be better off chlorinating manually.
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