Are all the electrical contacts between camera and flash clean? I don’t know this setup, but I assume you plug a box into the camera hotshoe, and it has a cable to the flash. The different contacts on the hotshoe normally connect things like the ready light, metering etc. I would try cleaning both the hotshoe and the contacts on the box that connect with it to see if that helps. Apologies if you have already tried that.
Alex.
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