I'm afraid that more than a half of miners don't have backup pool specified. Please set it up.

If you are using grs-sgminer 1.4:
--failover-only -o stratum+tcp://optimizedpool.com:3333 -u YOURGRSWALLET -p your@email.com

If you are using boost-sgminer 1.5:
--failover-only -o stratum+tcp://ny1.boostpool.com:3333 -u YOURGRSWALLET -p your@email.com

Having backup server specified is really important for uninterrupted mining.

Thanks