rbr50 loses brother mfc-j995dw printer

I doubt if this has anything to do with the "Apps and Services", which is where you posted your message. I also doubt if it has anything to do with the RBR50.

If the printer goes to sleep, then the solution would seem to be with the printer.

Set Sleep Mode Countdown | Brother

how do i wake my printer from sleep mode - Google Search

There is nothing that the router does to turn off the wifi to the printer, unless you have told it to do so.

You might get more help, and find earlier questions and answers specific to your hardware, in the appropriate section for your device. That's probably here:

Orbi - NETGEAR Communities