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The mouse icon on my Mac Mini (macmini6,2 - 10.14.1) has started stuttering. It's not always, but most often. Sometimes it's so bad the icon won't move at all and I cannot click with my Magic Trackpad 2.

I've looked at Activity Monitor (and top) but it doesn't show that it is doing much at all. I've closed down the more intensive background apps (e.g. Plex) but it doesn't seem to help.

A restart seems to improve things initially, but then it comes back.

I also occasionally see a grey box with a spinning sun like icon in it appear every so often. No idea what that is!

Looking for some guidance to locate the offending process, or if it is hardware etc.

I'm going to update macOS and see how that goes!

  • You've thoroughly cleaned the hole the diode sits in, and blown any stray cat hair out of there? Have you tried using a different, slightly rougher surface to mouse on. Once every couple years I have to scuff up the finish, polyurethane, on my oak library table to give the mouse something it can see moving. 400 grit is good enough. You won't notice it, but your mouse will. – Wayfaring Stranger Jan 24 at 22:01
  • It's a trackpad not a mouse. – neildeadman Jan 24 at 22:07
  • Ah, title reads mouse. Get someone to change it for you. My trackpad sits in my drawer, all but unused. – Wayfaring Stranger Jan 24 at 22:51
  • Do you see the same stuttering behavior when you plug the Magic TrackPad in to your Mini with its charging cable? – KarlC Jan 24 at 22:58
  • @KarlC It has only been a few hours, and I'd want to test this over days, connecting the MagicTrackpad 2 via a lightning cable directly to the Mac Mini does seem to have improved my issues. Any idea what would cause what I therefore assume is a bluetooth issue? – neildeadman Jan 25 at 14:39
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I can imagine two possibilities.

  1. Someone cleaned the trackpad with a detergent that created a charge on the surface of the trackpad, which is disrupting the capacitive touch mechanism.

  2. If the trackpad is connected via Bluetooth, you have a microwave source near you that is disrupting the signal e.g. a leaky microwave oven in a break room.

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