I just get the same problem yesterday and after 2 MacBook reboots I realised that my connected to laptop Apple Mouse was covered by some staff on m y desk and the staff weight pressed the mouse button which may produce the problem.
Actually I have similar problem a years ago with my Windows laptop when I forget to turn off my mouse and put it in the backpack, and when I put backpack on the bench some of the staff inside pressed continuously some of mouse button.
So check for some connected device that can be forgotten turn on and pressed by something.
IvakaVT
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