At the recommendation of EcoTech Support, performed a Factory Reset on the controller and re-calibrated. Ran over night at 50%. Time will tell if it happens again. All I can say... Under the circumstances, I don't feel confident running a single return pump at this point in time. Not a bad idea for anyone to run dual return pumps, and what I was planning on running on the main display that is in the works anyhow.
I will also say, as a guy who doesn't own any other controller at this time... I do like the ability to control the system via an app, web browser and being able to control the flow in the tank.
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