I'm sure one of the most liquid merchants in the game has a very good reason to close up their bank for a period of time. I've almost had to do the same for similar reasons. There is nothing sinister about it, just a "technical difficulty", especially with a bank as popular as his. Fairly certain that a quick message to ask for a withdrawal (if needed) will get you access to your funds.
We all hope to see you banking again, Capt Da Vinci. I'll keep the top two spot warm for you.