My wife and I went to Laos for 5 days to do her 3rd set of 60 days
We flew out of and back into DMK, immigration detained us for over 90 min. Made her fill out a form and wait. They were refusing entry to every single person I saw during that time. I also heard them say several times that you can only spend 240 days in Thailand in a 12 month period, she also told us that.
Luckily, I had a ton of documentation so she knew we weren't full of shart. They stamped her for another 60 days but told her it won't happen again.