OK, so I put some gold in the bank in case one of my characters needed some. But today it was gone. It was sitting there for a month. Has this happened to anyone else before?
Common problem people've been going through. It's not so wide-spread as to ZoS actually doing something about it, a handful of reported cases a week. It's probably WAY more widespread than it seems, and is probably effecting everyone if only to a small degree, but there are outlier cases like yours where you're missing a big chunk of cash. I'm sure there's also people that are missing a ton of gold but don't even notice. Anyway, it's a problem but tickets have been the only way to resolve it so far.