I have a C330. I have also experience periodic problems that sound similar to what you have described.

The only thing I can suggest is to really be observant about the top receiving spool and how it's seated with the winding knob. It must be seated perfectly. I'm not sure about having play in the back either. I doubt that I've experienced that.

In a completely mechanical camera like this, it's difficult when things are sporadic.
Good luck.