In the future I hope dev and admin of exchange can pre-announce the down time for the exchange. It looks bad for a downtime. Worst of all,
if it is pre-announced, traders can adjust funding, for example withdraw some funds from OpenTrade to other exchange to trade and then move back if needed.

Without a notice, it is not just a concern, but also add inconvenience, basically all the funds deposited are locked up until the exchange is back, maybe a day, who knows
may even be 2 or 3 days if the technical difficulty really kick in. I hope it is not too long.