This message is usually due to switching channels too quickly making the system think you're using more connections than you're allowed.
To fix this simply slow down the speed of switching channels or slow down when you are scrolling through the tv guide channels.
Other possible reason is due to using more connections/streams/ips than allowed.
See the link below for more information on connection/stream/ip
If you simply want to log out all devices at once to ensure no other device is currently streaming then change password.
See link below for instructions on changing password.
You will have to log back into all your devices with new password once change is made.