Finder window "out of focus"

Anyone familiar with this weird situation?

Every now and then, the content of a Finder window (on my iMac) is moving outside the border without creating sliding bars.

That makes the content (partly) invisible/unreachable. The navigation column has disappeared also.

Switching from icons to list etc. doesn't help. Throwing away the finder prefs neither. Reparing rights neither.

Swiping over my magic mouse, moves the content a little bit, but it jumps back immediately.

Jumping back with the arrows in the upper left corner . . . . no influence; other content, same problem

A minute ago it looked like this (screendump).

And it's only this window; other opened Finder windows are OK.

When I open a new window and open-up the same content/folder the problem is gone.

The problem can also be solved (I just found out, a minute ago) by choosing "Hide navigation column" and "Show navigation column" from the "View" menu.

Not sure if the menu is called "View" in the English version; in Dutch it is "Weergave".

Till . . . . an hour, a day, two days later . . . . . the same thing happens again. I cannot reproduce the problem.

It's not a mayor problem but still . . annoying.