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Rats, it would have been handy if C4 were the issue. Definitely still try a different outlet and adapter. And it seems unlikely, but maybe try replacing C1, or perhaps even upping the value slightly (3300uF)? TBH, we are rapidly approaching the limits of my knowledge here. If none of the above solve it, it may be best to start a new thread, since it would seem that your power section isn't the issue. Hopefully that will attract the attention of any folks who know PICs and/or Core8 modules better than I do.