Hi Kirk I discussed this with a colleague. We haven't had any issues with that power-input circuit on other boards, but will keep an eye out for similar behavior. You could try cleaning that area of the board with an appropriate circuit board cleaning solvent to remove possible contamination causing leakage. That may improve things. If you are confident that your 12V source is clean and doesn't have any over-shoot issues you could bypass that circuit by installing a fuse at F1. Best regards, Jim B
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