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At one stage a couple months ago I added a WIFI HDMI Transmitter which feeds signal from GPU2 to another 55" Samsung TV, but disconnected it and haven't used it since. That might have been around the time this started. I have the main TV plugged into GPU1 via HDMI and when the other via GPU2.

I just tried to switch the main TV HDMI from GPU1 to GPU2 but it happened again. I think since then I've done a clean Nvidia driver install too...