Well, check the last pages of this thread and then the 3 month chart: https://coinmarketcap.com/currencies/quark/ Probably anticipation for the incoming revival. New devs + turning hybrid PoW and now also PoS!
Buy cheap now or regret it later.
seriously? this will go PoS? meh, what a disappointment
Its not going straight POS - it is being changed to hybrid POW/POS in order to improve network security.