From a reliable agent I personally know in Pattaya.
Looks as if Jomtien Immigration have been pulled in to line on who now needs to report using the TM30. Before, anybody on an extension never had to report again unless they had changed their address
IMMIGRATION UPDATE TO TM30 REPORT IN PATTAYA:
New rule from Immigration. Any Persons coming into PATTAYA on any form of visa, Tourist (hotel or condo must register) or Non O, Retirement, Parent, Marriage, or ED visa must report to Immigration for TM30 Check every time they re-enter Thailand.
This also affects anyone with a multiple entry visas. They must also do a TM30 Check every time they re-enter even if their address is the same as the last time of reporting.