Randomly minecraft won't let me join servers saying Failed to join server: Invalid Session (try restarting your game)
After restarting game
Failed to join server: Invalid Session (try restarting your game)\
Checked help.mojang.com:
sessions was "fine"
evidently it wasn't because
Failed to join server: Invalid Session (try restarting your game)
After restarting game
Failed to join server: Invalid Session (try restarting your game)
This also affects snapshots
Try changing your Minecraft password, it's possible that someone else is using your account!
Does that happen with unmodded (vanilla) servers as well?
This is an account specific issue, and we're only taking reports of bugs in the actual game. For account issues, please visit the Mojang Support Center.