Fixtures losing signal

I apologize if I am posting in the wrong section. I am new to the forum and lighting in general. I am running Hog4 PC in a club I work at. Self taught and programmed everything my self. I recently have encountered the first problem I have not been able to fix on my own. Several of the fixtures lose their signal from the PC. They behave erratically, shut off, sometimes turn on 100% intensity and position randomly. They won't take any input from the programmer. My suspicion is that my hog dmx widget is going bad (if that is possible). Or maybe one of the wires/connectors. Does anyone know if this is likely or possibly the problem. Any advice is much appreciated. I apologize again, new here and self taught on all the lighting stuff. Thank you