I had a related flickering with my TT2 and M-scaler. Realized it was a faulty BNC cable (would occur when I touched it) and replaced it. Problem solved.
Nice. I was about to say that I've never seen it, check your bnc cables. I made a lot of BNC cables when I was a technician at Fermilab (1970s) and I know they can be fragile.
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