SENS TOUT

What should I check to fix a "SENS TOUT" err for a studio color575 M?

The LEDs for transmit and receive don't light up even though dmx runs through the fixture (my trackspots down the line reset themselves when I unplug the XLR's from the scolor then plug them back in).

My guess is that the unit doesn't see the data that's running through it, but how do I fix this?
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