Yep. Two workshirts, one button come undone on each + some unraveled/loose thread ends in the others. For what ever reason this seems to be a somewhat common issue with many machine-sewn buttons. No idea why this is the case, I guess some machines just suck at finishing the "final knot" equivalent? It makes one wonder though, I have some el-cheapo shirts (uniqlo) where the button's have stayed in place for years.