Just wanted to make others aware who are having issues with jumpy video; it could be due to your time zone settings. I live in Newfoundland, Canada and we are on an odd time zone (UTC-3.5hrs). While the cameras are able to sync to this time zone and show the correct time in the on screen time stamp, I can now confirm that it was causing the issue we were seeing with freezing video, jumpy video when trying to view recorded play back from a camera, and just a whole bunch of other problems which made the cameras almost useless.
After resyncing all my cameras to a “standard” time zone (I chose Atlantic Standard Zone with is UTC-4hrs), everything now works perfectly again.
So, if you are experiencing issues and have your cameras synced to a odd time zone, try changing to a standard one and see if it makes a difference.