need to leave and reenter. dont know if the fact that visa was issued while you are in TH can be a problem. Per regulation, Embassy cannot issue visa to applicant residing in TH
Thats the normal situation for tourist. What you are doing is visa run to bordering country and abusing the tourist visa. If you really want to stay long term then find a proper visa and extension of stay in the country. 180 days in a year on tourist visas is logical for immigration to check on you.