IT-KAV received kudos from Stormin Ben in Eset Endpoint v8.1 LiveGrid connection problem
I can confirm this problem with version 8.1 (we never had this problem before).
We had to set exclusions for livegrid on main firewall acording to the FAQ, but almost every day "test" computers reports limited cloud connectivity, even after restart. But flushdns command works almost immediately.
We stopped deployment to our computers until we know whats happening (we have 400 computers).