I fast tracked in BKK just now. Fastrak immigration said that I had been here too many times. My last visa was a six month multiple entry from November until April 30 and I have been in America since then. I did not expect this to be a problem. I have not had any visa-less entries this year or last year. 
Fastrak sent me to the regular immigration line and I am going to try again. What is my best course of action if that fails?