Fake-pockets button down

The button on the right elbow has fallen off multiple times and I had to be re-sewn, but I have other shirts from this brand and never had this problem, plus the other one is staying on fine, so I am pretty sure it's user error and a really easy fix. Otherwise a very durable and comfortable shirt. I have a few different shirts from Dana Buchman: Metal thingy: https://posh.mk/KU5ziH4d64 Patterned: https://posh.mk/efCaDJ7d64