Strange Mains ripple problem causes chain to lose signal

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Strange Mains ripple problem causes chain to lose signal

toddvirgil
Ok here's a weird one.

I made a grind customs fx Tenebrion reverb for a guy -- works great. But when the freezer kicks on on the same circuit, it loses signal. Cycling the footswitch brings signal back. Same goes when he plays it at gigs, it'll lose signal when the air conditioner comes on and then comes back by cycling the footswitch.

So, What gives? Its on a trex isolated supply. and seems to work fine otherwise. Its a really clean build. Is it possible that something in the line is screwing with the TL074? Is it a bad IC? Could it be somehow locking the belton up? I'm totally at a loss as how to fix it.

Any ideas??