I was just reading the XDA forums (also looking to see if anyone has a good fix).
Someone from NYC was reporting that the "pta" APN seemed to be working correctly now (11/15).
I'm playing with my phone in the DC area, and "pta" does appear to be working, although I can't test it on LTE until tomorrow AM. But webpages are loading without a hang at the end like they had been.
Maybe AT&T is actually fixing things? But thats probably too much wishful thinking.