Yes I had this issue. Always say you’re being a tourist. They asked me why I’ve been here so long(5.5 months) and I told them I was training Muay Thai. They said I’m not suppose to learn anything while on a tourist visa and that I could only try it. They also said that I can not use my visa to do border runs every 60 days. But I don’t think you will have an issue if you just say you’re a being a tourist and exploring the country
Train with all the trainers you want. Don’t let them lock you in with one guy… be straightforward up front so you don’t deal with the childish Thai behavior
Don’t go to one of these majority foreigner gyms… thank me later