I believe its mostly tied to the fact that Ripple is going up. There are probably bots tracking price movements in regards to Ripple/Stellar. However, I also believe that Stellar is making progress with the protocol. Just look at the fundamentals. They've got real businesses building on top of the rails Bext360, Tempo Money Transfer, etc.
My thoughts on what could be on the horizon is a Tsunami from the Japanese markets. This is just starting considering the legal stance Japan has taken to cryptocurrency. Stellar's graphic design is a PERFECT match for "Kawaii" culture. I only hope for more growth from Stellar in this area. Opening up the JPY/XLM pairing is the next step. I have been emailing most Japanese based exchanges to add XLM.