I have the same issue. Frequent disconnects. Wifi and LAN. Sometimes more than twice a day sometimes it’s good for a few days and happens again. I installed my nighthawk as an access point to try and not use the R2 wifi and it still happened.
I have a netgear cm700-100NAS modem > R2 > and now the nighthawk
R2 running latest firmware.
also set the lease hours to 168