Jonathan **************************
@Lawrence ****
If you've got a long-term visa, that's different.
As long as you always get a re-entry permit before you leave, then there are no restrictions on re-entry, as far as I'm aware.
The exception being ed visas. There have been people trying to re-enter on an ed visa, only to be questioned about what they were doing outside Thailand when they were supposed to be studying.
Denied re-entry, even - even with a letter from their school detailing why they were outside the country, and even after the boss of their school was on the phone with the imm officer.