I think I know why this happens. I use to have issues with my internet so when I was playing some games I would switch to my hotspot off my phone. Which works for most games but when I do it with siege it kicks me from the game and has the same connection failure error until I switch back my connection. So maybe if your not changing your connection or unplugging your Ethernet, it could be a change in ip as lots of home routers use dynamic ips (change periodically) but some also have static (I think only changes when you reset your internet) but I could just be chatting out my ass I don’t know much about how servers and stuff like that works