I had the same problem and we think we got it fixed by replacing both voltage regulators with new solid state ones. I say I think because I've only flown it a couple of hours since then but no issues yet. I talked to Don Niesser and he said that he's experienced it too and you need to replace both because one goes bad and starts sending stray voltage causing other things to fail. He had some in stock I think for $155 which was cheaper than Cessna which I think was $180.
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