Same issue with me, I was playing ffxiv on the steam deck around 2am eastern when it booted me out of a trust run. I couldn't log back in. This morning I logged in on my laptop, was booted off shortly after and again I can't get to the character select screen. Tried all afternoon and nothing. I work 2 hours away from where I live, tried there on the deck and it worked. Get back home to nj and same issue. I've reset my router and have a solid 450mb connection but can't get in.