@robrigo can you imagine hot wallet empty? That's really serious and looking the info i gathered some days back, i summarize is on this link https://steemit.com/bitcoin/@samest/poloniex-again-red-flag-showing-take-action-201788t101058725z . Poloniex this days we need all to stay off.
I dont think theyare trying to make bitshares look unstable to suppress there price, i think they themselves has issue internally. May be they have lost access to the cold or something else is happening internlly that is yet to reveal.
If this is the case, they've taken far too long to announce the issue - they've stepped into entirely fraudulent practices!