Im having the same issue, i was using RB and it suddenly stopped and told me my session was invalid. Which is weird considering if i got to my Buddy Auth it shows i still have over 20+ days before i need to resub. Waited about 30 minutes and now its saying Max Sessions, but on Buddy Auth it shows that nothing is being used so i cant kill the session. Waited another 30 minutes and being extremely impatient i went and bought a 3 day sub to try and go around the system. It shows the 3 days sub on my Buddy Auth portal but when i go to put it into RB it says the key is invalid. How can it be invalid when i copy pasted from you own buddy auth!? Needless to say im frustrated like Buddernutz said i believe its on there end.
My brothers RB is working perfectly fine in the other room, makes it even more irritating...