I don't know what another positive review will bring, maybe I can warn people about my problem. My previous 3500 mouse became unstable. I thought it was dust in the mouse interfering with the optics. I didn't want to take it apart so I found the cheapest 3500 to replace it. The new one did too. I searched for a solution for Windows but nothing helped and the problem seemed to get worse. I moved the USB receiver from the rear port to the front and the problem went away. It was interference from the Wi-Fi adapter card on the back next to the USB port. If you experience this problem, try plugging the receiver into a different USB port.
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