Darkglass SpeakOn cable cutting in and out

I'm running a darkglass alpha/omega 900w head into a dg212n cab with a SpeakOn cable. The sound cuts in and out sometimes requiring me to jiggle the cable. I've opened up the cab, retightened the screws and saw nothing wrong. Any ideas on how to troubleshoot? Sometimes I'll wiggle and try different inputs/ outputs but the same issue persists. Any ideas on what can be done?