By the way I went to Nongkai last week to ask 2 different border police and they looked at me like I was stupid, saying I can cross 2x each calendar year. I told them I came a lot already and airport harassed me, they just kinda laughed and said "new rules" but didn't explain what they meant.
It's frustrating as the police keep telling me there's no limit when I ask them at Laos border and Udon police. But airport seems to make up fake rules. Seems the only way to know is ask other people what's happening lately.
First came in Jan exempt, then came back airport exempt again. Then got 60 day TV at Laos and crossed by land. My last trip to Singapore and back is when I got harassed at Don Muang. Currently am exempt again.