Mouse sensor seems to have broken

My G305 has been working pretty much perfectly for the past 2-3 years but I went away for a few days and now I've come back and the sensor seems to be dead. The battery is new and the lights on the mouse work and aren't flashing red like they usually do when the battery is low but the infrared sensor light is gone. I really like the mouse and it was pretty expensive for my budget so I don't want to have to replace it bc I wouldn't be able to get another 305 so I wanted to know if there was anything I haven't thought of to fix it before I try taking it apart.