Cubase 9 doesn't always come on top

Cubase 9 doesn’t always come on top again, actually it only comes once, using the taskbar

When i have several programs open and and cubase isn’t on top i have to minimize a program, it doesn’t matter which one, then cubase comes on top again when i click the open instance on of cubase the taskbar.
But when i switch programs using the open instances on the taskbar it never returns in focus, till i minimize another program
This only happens when using the taskbar, When i use Alt-Tab it is ok