Does running P3D minimized for a few minutes produce blurries

Trying to trouble shoot this sudden blurry problem, and I notice that if I am flying along and minimize P3D while flying for a couple of minutes, when I return to full screen, does it produce blurries. This is what happens every time I minimize for over a couple of minutes, and when returning to full screen sometimes it takes over 30 seconds for the burries to clear up. I need to know if this is normal P3D behavior or not....