Some people (e.g. my wife ...) inadvertently touch the touchpad while using the keyboard, and then weird things start to happen
... I found for myself a solution: in the settings of the touchpad, I unchecked "tap with one finger to click".
...I was working on a file accessed from a memory stick. This was loosely plugged in and any vibration of the desk caused the stick to rattle and repeatedly reconnect and superimpose multiple search screens on top of the music program's active screen...
And of course pounding the desk in frustration didn't help, I bet!
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