Dock stops magnifying and highlighting, it's same wth other links and icons

I have noticed a couple of times that my dock starts acting weird. It stops magnifying and highlighting icons. When I click the desired icon, it magnifies it. It stays magnified when I move mouse away and until I click something else. Its darn annoying. Kill Dock in terminal doesn't solve the issue, only rebooting does and I don't want to do that every time. I occurs on random, don't see a pattern in it.

Also, highlighting or "on roll over" functions are not working for other types of links and buttons including websites. Cursor doesn't change in to the finger etc.

What to do, what to do (beside rebooting every time).