I've been using a visa agent for my marriage extension since COVID started. Before that I was using multiple entry non-O. This year (the third extension) my wife decided she would get help from a friend who work for a visa agency and do the paperwork herself. Yesterday, she got a call from immigration and they want to know why my last stamp were from an office in a province where I didn't live. I didn't know this could be an issue... They want to interview me next week and make me sign a report. It might be nothing but it's stressful since I have two Thai childrens and a lot of stuff after all these years.