Thank you.
Pool settings on all my rigs are the same. But only this rig has that issue.
trying version 0.8.3 - same issue.
Try any other pool on this rig, if issue goes away - flush DNS cache of your problematic rig, you can do it with
ipconfigflushdns command from CMD with administrative privileges, then restart.
If not, try starting miner with limited number of devices running,
-d 0,1,2 , etc. Until you find exact device causing problem.
If it'll still be there, try reinstalling videodriver.