I've had the mouse for a while now and sometimes it just starts jumping and it becomes difficult to hit areas, especially in graphics programmes, which is annoying. Anyone have any ideas what to do about the jumping? The receiver (Logitech) is only about 20 cm away and is not covered by anything. These are actually more than optimal conditions. Should I perhaps try a Bluetooth adapter? Could it be more stable than the stick that Logitech supplied?