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Steveo, I had a different issue, but mine was related to the plug itself. After swapping it out for a new GFCI plug, everything worked like a charm.
Are both transformers plugged into the same plug? On the same circuit? Assuming they are on separate circuits, you may want to try replacing the...
Problem solved - it was the plug. Swapped out the original 120V plug out for a new GFCI and it works like a charm, no further issues....