paint "dripping" unintentionally

I was working on a painting with watercolor/gouache brushes when an hour or so in, it suddenly started dripping, mostly in straight lines, but sometimes they'd come to a point and change direction. I tried saving, closing the program, and re-opening, and it continued to happen. 

Hello @tedioustendencies, 

Is there a chance you turned on a Titl tool accelerometer? This determines the drip direction.