It’s not directly the DTV, but I just want to share my experience.
I got my DTV, it got stamped as usual for six months, as I had already had a thai driving license, I want to renew which you have to do after two years.
After two years, you get normally five years driving license.
So I went to the "Songkhla Provincial Land Transport Office HatYai” to renew.
After checking with a lot of employers they called the immigration where my certificate of residence was from, and they confirmed my Visa is only valid for six months.
So I got only the license for another two years instead of five because nobody knows what’s going on with the DTV 🤣
But one thing I have to say, all people that are very friendly and helpful, not like at the provincial land transport office in PhangNga.