Glad you got it flashed!
Two things:
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I released v6.1 with a fix for that issue (and another small bug) Release 6.1Rt · thandal/eppg-controller · GitHub
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I’m in the middle of testing changes to improve robustness to RFI (see my other thread Random Throttle Controller resets? - #7 by nfairfield) – I have some promising results by shifting CPU and/or flash frequencies. Hope to have a new release coming soon!