Each time I fly to the USA (I'm a US citizen)- I am ALWAYS asked to step aside and wait "over there". This has happened for the past 3 years at each entry.

My name is not common at all and I don't have a criminal past (well, just some speeding tickets, and underage drinking in college). I've been working overseas for several years. Each time I am asked the SAME questions-

How long have you been working in Japan? Where have you lived previously? Do you have any other ID besides this passport? How long have you been a citizen? Are you aware of any warrants for your arrest? How much cash are you carrying?

Sometimes this takes an extra 30 minutes and sometimes 2 hours!! I have NO IDEA what the heck they are looking for. They never tell me why I'm flagged. They have whispered conversations and point to the computer screen a lot saying to each other 'look at this" "but look at this" "yeah but over here it says.."

My bags are never searched and they never get hostile or aggressive towards me. They also seem to know that I am being 100% honest with them.

What should I do? I am really afraid that I will be arrested or that I'll say something incriminating.

Now I always make sure that I have a loooong layover before my connecting flight. I fly to the US about 5 times a year.

Any advice?