I've been watching this closely, and the price seems to be driven by the Segwit2x signaling rate. We're close to the %80 activation and when it looked like we weren't going to make it we saw a decline, and when hash power switched signaling and the price recovered.

The reason the hash power signaling is not so stable right now has a technical reason-- Bip-91 is rushed, the Segwit2x proposal was rather late in the game and this is a system which, by design and prudence, should not be changing with quick untested commits.