When my elite ran out I went to Vietnam for a few days then did the visa exempt to non-0 route. Just remember your elite has to be expired when you return. Nobody could tell me (and believe me I asked plenty) what would happen if I just had a day or two left on the elite. Pain in the ass but you can't do anything other than wait until it's expired.
Jomtien immigration now require the tm30 in your passport to be dated AFTER your latest arrival in the country so yes if you leave the country you now need to update your tm30. Recent change so understand why people are saying no. Other immigration offices may not need this.
Sorry to bang on about this but I have another question. I got my updated tm30 done today and I noticed there is an expiry date which matches the last day of my rental lease. I've rented condos before for multiple years and although I signed new rental agreements I just kept the same tm30 and my 90 day reports were straightforward with no questions asked. Is this something else we need to be aware of and file a new tm30 every year even if you're staying at the same address?