The value on coinmarket has halved over the past day or so... correlation to BTC or just growing pains?
Personally I think it has to do with the exchange, yesterday there was over 10 btc worth of buy orders for noble, this morning after if came back online there was only 2, I think it's possible potential buyers left the market due to the instability of the exchange as it can be quite frustrating to put in orders and then have it go down with absolutely no update or idea when it will come back online and if your watching your trades this can be a little bothersome. And obviously if people are trying to sell and there's no buy orders the price is gonna drop as people try to fill the few buy orders that remain... and difficulty factors in quite accurately as well.
That's just my 2 nobles though.