To any fellow RSA D3 players:
Update on this problem: I am now using a VPN service, after being advised in another post: Error 1016 Can't login - #12 by FrozT-2504 , and have has absolutely NO 1016 problems since.
If you are also on the EU server, my advice in this regard is to look for a provider that suits your needs and budget constraints, and make use of it
I am currently using proton VPN, which has a true free service available.