I'm seeing these messages now (ongoing). Full of such messages.
Edit: Restarted my miner. Seeing SG node dead. Mining on main node.
What actually are you mining with and what's your username - (PM me if you want)
There's only a few users on the SG server that make up the ~135TH on there.
If you are running linux then do the following 2:
mtr --report sg.kano.is
mtr --report stratum.kano.is
Also if you swap to the main pool stratum.kano.is does that make any difference?