Def. not normal. Mining equipment uses very little bandwidth...like next to nothing so if you are having issues with it connected something else must be up.
Perhaps you can post your config (minus passwords obv.) here. Lots of people here know these devices inside and out and might see something helpful.
BOL.
This is a default config BE Cube, with these problems. Changing the IP to 192.168.1.200 seems to have fixed it for now, hopefully it maintains stability. Thanks for the help guys!