Probably several reasons: whale/pumpers left the coin (see volume), development continues in secret and non-transparent way and the coin team (not just dev team) is not communicating properly with the community, devs haven't updated their whitepaper, pastebin chats reveal many things about inner working of pump group, probability of getting on btc-e is getting smaller and smaller (volume is approaching 0) etc. And so investors are starting to lose confidence (visit some very anticryptcoin forum/chat - btc-e trollbox for example - for some "sentiment analysis").