Beginning of this year when I filed my own TM 30 for condo I rent in Bangkok Immigration at MTT told me that as long as travel away from condo is only Thai domestic then I donโt need to file a new Tm 30 each time I return to the Bangkok condo. Maybe worth double checking. Immigration changed the regulation for specific visa classes including Imm O Retirement which I have.
My understanding is that there was a big outcry last year from business, diplomatic and other circles who need to travel regularly within Thailand because of the onerous process with the TM30 every time.