I live in Rocklin, 30 miles outside of Sacramento.  My Gektv was buffereing really bad pretty much starting from Feb of this year.  Gek told me it was an ATT issue as well, I am using ATT Uverse as my tv service with their internet.  I basically could not watch Gektv  for about 3 weeks, then everything started to work properly, no answer to what happen, but it works.  Hopefully yours will start working soon as well.