Game disconnects me from time to time without reason.

My first thought was that someone else is logging on my account from another location and that's why it's disconnecting me. I checked my account info and it says that "last seen: 1 Minute ago from 54.148.231.248". It's wrong because it's IP from United States (provider: AMAZON) and I'm from Europe. It happened few times already that i got disconnected from server and in my account info there was info that "last seen" was from various US ip's. I changed my password, enabled Two Factor Authentication, checked my e-mail logs and on top of that yesterday I did full windows reinstall so my PC is 100% clean and I just got disconnected. It's happening for almost 3 weeks now.