Yes, just changed frequency in advanced settings. Hashrate stayed 0 for a couple of minutes so I restarted it and could not connect to it anymore, got a bit scared. Turned out DHCP has assigned different IP, changed it to static to avoid future issues and has been fine since. Never seen any Xs but I only had it for less than week and played around with it a bit so it has not been running for long periods at the time. It does get HW errors on 2 hashing boards but it did it before overclocking as well and it's not too much of them to affect actual hashrate much
Also funny thing it found 3 blocks on the first day and none since that. If I was solo mining that day it would have been 75 LTC- £3000+
