Sensor Classic "ETCLink Fail"

All of my racks are Sensor Classic. Sometime last week I noticed that a bunch of my fixtures were flickering...not good. So I went to the dimmer room, one of the racks is showing "ETCLink Fail."

Reset the rack multiple times, still shows ETCLink fail. All the dimmers in the rack still respond to DMX input, they just flicker when they are supposed to be "out." The racks are also connected to an Analog Address control system.

Any thoughts on why this just randomly happened? And how to fix it? The rack is right between two other racks that aren't showing any failures. 

The plan right now is to clean all the racks and double check that none of the data cables have come loose. If that doesn't work, maybe reconfiguring the module.