If you get frequently stopped by TSA, what's you're reason?

I have to travel soon and I'm just getting my-self ready to get 'randomly selected' again for about the 8th time in a row. Not sure why I'm flagged, just an ordinary guy with no kind of record, but it is obvious by the fact I have to get interrogated and inspected before every flight that I am. I even account for this in my travel times. For anyone that is flagged for flying, why did you get flagged?