I have had issues the last few years coming back a second time to the country. Sometimes after coming here initially with an e-visa from the US, sometimes just the stamp, etc. I've done a lot of variations, NEVER coming back more than once in a year, so basically two entries. A couple of years ago it took me 20 minutes before the officer let me in. EVERY time in each of those three years, upon my second time coming in, they pretty much interrogated me extensively, and asked me for my flight back to the US.