Zip tie/ tape the black power cable to the camera to make sure that it is receiving a constant supply of power. I don't know if loss of power will cause the symptoms you are seeing, but it wouldn't hurt anything to try this.
Same goes for the CAT 5 cable that runs from the camera to the bridge.
Without more info, I (nor any more qualified people) can truly help. It would be nice if you posted some of the specifics of the system that you are using. Error codes (if any) and "external events", like the robot being bumped, are also nice to have.
Good luck, I hope you figure it out.
