Pitasoft will reply with some (generally useless) troubleshooting tips. The most likely culprit is damage to the cable or connectors. Once they've gone through the usual "try a firmware upgrade/downgrade", they'll tell you to contact your dealer for an RMA. Might as well do that now. If your dealer won't help, Pitasoft will issue an RMA directly, but since you're out of warranty there will likely be a flat-rate replacement cost (and you'll be without the camera for weeks/months).
I got lucky'ish. My 650S died completely, and I got a reply from Pitasoft within a day, but in the end they pointed me to my dealer. The dealer had a flat-rate RMS (I send to them, they send to Pitasoft, Pitasoft sends a replacement, but with the caveat it could take up to 6 months. For not a lot more, they could just swap in a refurb immediately so I don't have to wait. But when I asked, for not a lot more again they allowed me to upgrade to a refurb 750S. Since the wiring is all the same, I just had to send back front/rear & both mounts, and they've sent me the 750S front/rear/mounts. Now I can take advantage of the new firmware features.
When this one dies, hopefully by then there will be a whole new viable replacement brand built for longer-term reliability, but with the features I want (so far, no contenders).
Note that since you're likely paying for a refurb anyway, maybe poke around for people selling used/refurb units, and just skip the Pitasoft conversation.
Brad.