There was an unexpected error (Timeout on setWPTotal)

We have 4 rovers using the current version of Ardupilot Rover with a current version of mission planner. Each rover has a orange cube pixhawk with a jetson nano(ros) for lidar. Every thing works normally when 2 specific rovers are connected. If we add either or both of the other 2 rovers we get the above error when writing to either of the 2 rovers. If we disconnect the jetson nano from the two rovers the missions write to the rovers with no issues. We currently do not see anything code wise or setup different between the rovers. Also we received 2 rovers 6 months after the first 2 rovers. The first 2 rovers are the rovers having issues. Any suggestions or thoughts would be helpful.