Sometimes some worker shows offline on Omar pool.
but miner shows working.
Seems pool not stable?
OmarG Pools has had problems before, but if the miner is still getting work and submitting shares then it sounds as if the pool backend is still working as it should. If you worry, set up failover for your workers so they can switch to another pool in case OmarG's pool goes offline.
Don't forget that the Solcoin team has an official P2Pool which is maintained by us, and always online: stratum+tcp://p2pool.solcoin.net:8360 with mining info on http://p2pool.solcoin.net:8360/static/.