Thank you for the answer but as SoraWsh said, this does not resolve the issue for me unfortunatly

The problem is still active as i wrote those line and i had to activate my VPN to solve the issue.
I understand the issue can be hard to resolve since it's not in SQUARE ENIX end but it's not on my end either; it's "in between" and there is clearly a saturation somewhere from some ISP who use that specific routing.