1 of my rigs showing offline from smos dashboard but when I check the pool it hashes .Anybody having the same issue?
Yes, you are not alone

Your 'stealth' rig contain nvidia cards and mining eth?
Exactly
Hmm, possibly hang Tytanic's stat-script while parsing miner output. Miner clymore 11.6? (currently i use 11.7 and this issue not appear 24+ hours, but this not clear - i upgrade all rigs from usbsticks to ssd with flashed last release candidate version of smos)