Active Optical Cable - Suddenly No Picture


I've been using a 10m AOC cable for over a year with no issues. Yesterday I didn't get a picture on the projector, but TV OK.
Projector displays a Roku stick plugged in locally to both ports.
HD Fury Vertex 2 TX1 and TX0 output picture and sound to TV at 1080p, projector output had been set to 4K. Vertex 2 shows that there is a projector connected with the EDID, so I don't think cable has been gnawed through under the floorboards.
AOC cable connected directly Sat receiver to TV and no picture but again shows the TV EDID.
Direct rigged copper HDMI Vertex 2 to Projector and there is a picture at 2K, up to 4K and the Vertex 2 can't sync properly. The same lack of sync is with the AOC cable at 2 or 4K.
I guess it is the AOC cable with enough of a fault to fail to sync and pass a picture but sufficient to show projector EDID and connection status.
Looks like a call to Kennable tomorrow. 13 months old!!

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