I have a MASSIVE amount of 90002 errors since a little while back. It varies between a few / hour to a few per MINUTE. Interestingly enough, NOSGOTH, another SQUARE ENIX title, is ALSO giving me constant disconnect issues.

No other game on my PC has these issues. Everything runs fine, except FFXIV: ARR and NOSGOTH. The only two SQUARE ENIX titles.

I'm stated in Europe with 100/100 MB/s.