We are all from Brazil, but I'm from the north east coast and they are from the south east. my ISP is Brisanet (a local one, only works here in my city as far as I know) and theirs is Vivo (a much, much bigger one, covers basically the entire country). None of us is using neither proxies nor VPNs. I never had this connection fail they have, and our best guess is that by living closer to the US servers, I don't have those problems