I came back to Thailand on 28th April, I have a retirement visa which i need to renew in June. I did my last TM30 around 6 years ago, so i decided to go to Jomtien and check as this issue has come up before.
So on 29th April, I got all the necessary paperwork and copies of passport, entry stamp etc and went to Jomtien, waited around 10 minutes and got a new TM30, I asked the girl who processed it, if I needed to do this every time I re entered Thailand, she said if you are on a long term visa, so Marriage or retirement etc and staying at the same address you do NOT need to make a new TM30 unless you change your visa status!