i think my G5's laser functionality is failing, as sometime the cursor not responding to the mouse movement. The buttons are responding to clicking, though. I tried it on my laptop, it also intermittently works well for awhile. I put it back with my desktop on different usb connector and on few occasions it end up with same problem. if i banged it couple times on my table it may work for while or couple days but then it starts to misbehaving again...