It seems to be working great for the past 2 days as long as my wife stays on her new wifi adapter, so i guess in the end we can chalk it out to the interaction between her on-board network card and ffxiv in conjunction with our shared wifi.
I am still slightly dissatisfied as i could not narrow it down to the exact cause of the issue but i will take the fact that it at least runs flawlessly now as a win and roll with it

Thanks everyone for your responses and hope to see you in game!