First, all connections for ESS are blocked, except for one update server. Therefore ESS can not know what the server is down.
Secondly, ESS periodically tries to connect to one, then after a while to another ip address. As I said for all the time that I monitor the network connections ip address from edf.eset.com ALWAYS was the only "137.135.12.16". Before that time, I had never seen him change.
Thirdly, I always wondered why the products of a private company with the headquarters of Slovakia dozens of times a day establish connections with servers in USA. I have been using ESET products for a long time and any deviation in their work causes suspicion. Especially considering the fact that antivirus products stand in second place after the OS to steal user personal data.