What issues might I face when re-entering Thailand on a tourist visa after frequent short exits?

I usually use just the passport.Visa exempt stamp in my passport and then I go out of the country every sixty days and I have had no problems. This trip I have a tourist Visa which is valid until October multiple entries.And at the end of the two months I went to laos and when I came back to don muang i was pulled aside and taken to an area where they looked at my history of traveling. They made me show them my Visa. My bank accounts in America how much money I had on my hotel reservation, My return ticket to America which is in October and also I had to get my girlfriend's I.D picture and show them that. So after all that they did allow me entry but they said if I try to do a two month exit and come back again they will possibly ban me from coming to thailand. I thought the tourist Visa would not be a problem.So what everyone has been saying about it becoming more difficult to come back into thailand after short exits is true. As of today I will be leaving one month before my return ticket date. I may go to the immigration office and try to apply for an extension and see.I have the same problem.I did at the airport. Anybody have a suggestion on that?