@John *********
I have never filed a tm30 again after being away for up to two weeks before returning to my registered address. However, I was reprimanded for not doing a second 90 day report on returning to my home location after doing one in Bangkok. Of course, doing the 90 day report on line if you are not at home solves the problem.
Out of interest I just got an email from immigration services reminding me my 90 report was due following the last one being done on line. Things are looking up. I'm in UK currently so I can ignore it.