Random things happening, mac out of control

Hi,
I have been facing problems with my Mac. For the last 2 days random things have happened, like opening and closing files by itself, the mouse is out of control, the webpages are zooming in and out by itself, typing is very difficult (the cursor changes randomly, it highlights and erase things I write by itself).
I have no idea of what's going on with it! It looks like someone has invaded it.
It's updated, and I used an antivirus to check, nothings was found.
Does anyone knows what could that be, and how to solve it?
Thanks,

If it's a MacBook Pro, then your battery may be old & swollen enough to cause the trackpad to misbehave.
If you have a mouse or external trackpad to test with : Enabling the "Ignore trackpad when mouse or wireless trackpad is present" feature

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Random things happening, mac out of control

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