Problem With Wired Brother Printer

I have a Brother network printer connected by wire to my Orbi RB40. It correctly obtains an IP address from the router. When I look at the attached devices on the router it does not show the printer as connected. Looking at Advanced, Security, Access Control, it appears in the list of allowed devices that are currently not connected. If my laptop is connected to one of my satellites, either with wi-fi or hard wired, I cannot ping the printer ip and the printer shows as offline. If my laptop is connected to the other satellite or the main router, either with wi-fi or hard wired, I can ping the printer ip and it shows as online. I have PRTG network monitor running on the laptop and it sends me an email when anything happens on the network. The laptop is normally hard wired to the satellite that does not appear to be working. Over the last few days PRTG has been telling me that the printer is down and then back up again. The downtime is usually for several hours. Yesterday ,all day, it was down. At 2am it was up for 12 minutes and then down again for over 7 hours and was down again this morning. This implies that the satellite can see the printer occasionally. For the time being I have switched off the satellite and the printer connection is fine.