Sorry to disturbing here, but in my case no zones and no rules changed, so I'm gonna close these out. When the OS is starting I have (let's say about) 15 minutes without loosing the internet and after It needs to manually repair the connection to get internet back for (let's just say about) 5 more minutes and so on and on...
Same conclusion for me, when I disabling all the mentioned 3 protection, the internet staying, just without protection and this nobody wants it.
I have the ESET firewall log window always open separatedly and when I see Packet blocked by active defense (IDS) 192.168.x.A 192.168.x.B ARP I know the net is gone and need to manually repair again.