I've been playing bass for seven months now, with a rental bass and, until recently, a rental bow (I just bought a French style bow made by Erich Steiner). I frequently have a "bouncing bow," where my bow doesn't stay steady on the strings. I don't think I'm pulling off the strings, I try pretty hard to stay on them, but every once in awhile I still have a bounce when I start a new bow stroke. My teacher isn't sure why this is happening. It happened with my rental bow and it happens with my new bow. Would a heavier bow help reduce this, or is it just a matter of time and experience? Thanks in advance.