That sound like a major pain, but before calling Kyocera, you need to debug a bit more ( suggestion ). Failing panels should not have current goto zero, that sounds like a wiring issue as when a panel internally has an open, the bypass diodes kick in and the remainder of the string will produce SOME current, not zero.
Before the string in question fails , open all the Jboxes in that string and then when a string goes to zero current measure each panel ( gently ) and see when the circuit is open what is amiss . If I had to guess, its possible its something as simple as a connection or two that the screws in the Jbox are not tighted by the installer
If you find that is yet again another defective panel, I'd raise this back to Kyocera ... it might be possible that some refurbs worked at the factory but in all the movement have caused more intermittent open connections ... please keep us informed of what you find
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