Tracking down a bug: losing primary club

For those of you in clubs, that little flag next to the name in the UI shows which one is displayed next to your name (i.e., your 'primary' club).

We've been noticing recently that this flag gets turned off entirely 'sometimes' and we're not really sure when that it. It can be hard to notice since you don't always check your club list. As far as I can tell I just log in sometimes and it's toggled off.

We'll solve it, but we've been having some trouble narrowing down the cause so we figured we'd bring it to you guys. So if you have any additional details, or if you can reliably create a situation where you lose your primary club, let us know!