@Wil****
and
@Da***
you need to READ and understand the post.
The O/P holds a year-long, multi-entry Non-O visa that EXPIRES on the 4th of Sept. They are RETURNING to thailand on the 5th of September <- Last time I checked that's a day AFTER the visa expires meaning they can't get stamped in on it no matter if it's a multi-entry or not.
IF they want to keep their current stamp "alive" while they exit/re-enter the country they need a single re-entry permit