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E.g. there are multiple instances of Windows Explorer. Hovering on taskbar icon to show multiple thumbnails becomes unstable, it takes some time to move mouse to see thumbnails. However, certain instance cannot be brought to the front, click on a thumbnail clears all thumbnails without bringing focus to selected one. Clicking on taskbar icon results in thumbnails flicking and disappearing. This behaviour not from the very start, after fresh reboot all works as expected, then something in OS or certain application breaks the expected behaviour. It also affects my remote session in RDP as soon as it is broken for my home computer, similar problem does appear on remote.