I understand currencies and how depreciation can affect big corporations and trade etc but the average American travelling to Thailand for a vacation obviously not...so i stand by what I said you dirty lefty.
Normal tourist you will be fine. You haven't stayed full 60 days on any of your visits and you are away months at a time between visits so it should be no problem.
even with a 6 month visa I was getting hassled on every entry. Immigration officers (only women) are absolute jobs worths. Power trip like crazy to cause you problems.
Yew it is common i got told off twice. Best thing to do is just apply for 6 month e visa if you want to stay there longer. It is multi entry so you can travel other countries while it's active.