@John *******
Odd you say that as I asked this question at Chiang Mai TM30 office ~ 10 days ago. I asked 'if I go to another province for a few days or weeks, stay in a hotel and then return to my normal residence where this renewed TM30 is for, do I have to report my return to Chiang Mai and do another TM30?' . The answer was a firm 'No, only if you leave Thailand and re-enter you need to report your return to this address or a new address.