Trackpad keeps selecting, anyone an idea how to fix this?

The trackpad of my macbookair (2012) keeps selecting. On the screen appear squares and while using applications it keeps selecting...
the problem started suddenly, while I was working in Word, no clear cause...
Does anyone have an idea how to fix this? Thanx

Check your battery's condition. An aging battery can fail in a manner causing it to swell, exerting pressure on the trackpad from underneath.
Jumpy trackpad operation also can be caused by third party power adapters, among other things. Read Portables and Magic Trackpad: Jumpy or erratic trackpad operation

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