I don't know if this is of any help, I had much the same problem. I found that when using a wireless router, and wireless mouse the signals would conflict with each other. Sounds much like what you are encountering, my meter would activate/swing without even touching the mouse. A process of elimination showed where my problem was. First I went to the wired mouse and found thing to have improved, then I did away with the wireless router and found I could still use the wireless mouse. Simple fix, for me, Hope this helps some.