Got this Whitesville t-shirt a few months ago at Self-Edge (a two pack for about $100) and probably have worn it 20ish times. Just noticed today this collar issue, which looks like it is coming from a loose thread on the same spot on the inside of the collar. Am I doing something wrong in how I care for these? I just wear and wash in the washing machine. My understanding was that Whitesville construction quality is very high, and I've otherwise loved the shirts - great fit and feel.