"If you look at the bottom of the mouse you'll see a small window in the shell and inside you'll see two lenses. The smaller one is an IR light source and the larger is the photo detector array. Basically, a grid of light is projected onto the surface and as the light is disturbed the sensor is able to tell which way you are moving the mouse (some very cool stuff is going on here!)
Anyways... you likely have some dirt on the lenses or you likely have a weak battery. Carefully take a dry cotton swab (Q-Tip) and give it a quick wipe (spinning the swab) see if that solves it. You may need to check your cable and connection that you are in fact charging the mouse."
At last, it has worked for me ! The problem on mine came from the optic sensor. There was dust on it.
In 15 min, the problem was solved.
Unfortunately, it has needed to open the mouse, because the dust was directly on the sensor. But don’t panic, it is far more easy than described by ifixit.
Very easily actually.
1st of all, don’t try to unglue the alloy case from the plastic case nor the ultragliss black feet. It is complicated, long and totally useless.Use a plastic tool as it’s shown on step 6. Put it on both side of the mouse, between the lower case in alloy and the the white upper case of the mouse and it will be removed. There are only 4 clips, 2 by side. (Be kind with the clips, they doesn’t need a lot of torque to be removed)After, remove the 2 screw of the rear of the mouse, those with the metal bracket, and remove the connector of the white upper case.
To remove the motherbord :
Remove the 4 screw of the front (3 + 1 with a metal spring),Remove the mother board and unplug the power connector.
To clean the sensor :
on the motherbord, remove the 2 plastics parts that protect the sensor : one is transparent with 2 lens, the other is in grey with a little hole.
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Clean bothNow you can access directly to the sensor. To clean it, prefer air. note : don’t touch it with finger or with cotton, it would be worst.
Now you can reassemble the mouse and try it. I hope it will work also for you."
"Slamming the mouse down on a hard surface worked for me. The problem originated after leaving the mouse hooked up to USB for charging overnight while computer was shut down. After booting up in the morning mouse no longer “connected” and would not connect until physicality applied i.e. slamming it down on a hard surface; however, this did nothing to make it work on my mouse pad… only hours later after having read about someone, Rey J, slamming it down again, then it worked. Mind you I had tried all other ways through bluetooth connecting beforehand. It looks like Apple products need to be given a $@$* kicking now that Tim Cook is CEO!
In order to avoid this 'slamming down' situation, and since I have two of them, as soon as I notice that my admin mouse's charge is near depleted, I will recharge it while using the other mouse. I now avoid recharging when the computer is shut down."
"My mouse stopped tracking on a mouse pad, and eventually on a black wood desktop. Being wary of damaging my year old mouse, I read further about using compressed air on the lenses. I had already tried wiping them, which did not work. As a photographer, I always try my hand blower
before air on possibly sensitive equipment. It worked."
