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I have a Magic Mouse 2, Magic Trackpad and Apple keyboard. From time to time, mainly when I have higher CPU usage, my mouse drops it's connection. I have my trackpad next to it and it is still working fine, as is my keyboard.

I think I have narrowed it down to the amount of screen I have attached to my computer. At work I have a Dell 43" 4k screen and at home I have (2) 27, 1(34 wide) and (1) USB Screen. If I have all screens running then my mouse drops more frequently.

I have a 2018 Macbook Pro 15 with 16gb memory, i7, 4gb video memory

  • When you say it "drops" do you have to reconnect it or does it start working again? – Allan Sep 11 at 13:49
  • @Allan It will reconnect in a few seconds and then it works for minutes or hours. – brentwpeterson Sep 11 at 14:03
  • Are you certain it's not lagging? Disconnecting and lagging are two different symptoms. Check your BT connections from the menu bar to be certain that it in fact has disconnected. – Allan Sep 11 at 14:04
  • @Allan I get the little mouse connection lost overlay each time it happens. I will try to take a screen shot – brentwpeterson Sep 12 at 17:03
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The problem was related to a cheaper dongle for HDMI. Once I removed the dongle my mouse problem disappeared.

It is related to this issue. I did not try wrapping the dongle in foil, but removing it completely solved my mouse dropping issue.

Macbook loses network connection when connecting external display

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