Difficulty made a very weird jump. It went from 642.97400619 to 160.something (estimate was about 360) to exactly 642.97400619 again. 
Every 720 blocks the difficulty changes. So it will be most profitable to mine the 720 easy blocks, but your payout will be slow as it takes 720 blocks to mature.
So the miners will need to put some hash to it also at the high diff blocks to get their payout. This ensures that miners wont be dumping, but selling of slowly (if they sell, i think alot just hold).
Just another genious thing about this coin.
When it is slow there is less currency mined too, sometimes 5x less.
BTM Supply: 792240 BTM, and we had planned: 957700 BTM - there is 165460 less BTM in the world
So while the hashrate is slow you find there is no currency released that was just mined, and no new currency to speak of. 2-3000 BTM per day when the trading volume is 10-20x that is not much.