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?
TLDR : Answer Summary
The user faced issues with the Fast Track immigration process in Bangkok due to frequent entries but was eventually allowed entry through the regular immigration line. They plan to apply for a 30-day extension once inside Thailand. The comments provide insights into the experiences of other expats and advice regarding visa types and interactions with immigration officials.
NON-O RETIREMENT VISA RESOURCES / SERVICES
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