blacking out problems

[bajoxfy]

I am tearing my hair out. I use FSX SE with PlanG 3.2 and Windows10. I can fly pmdg 737 with few problems. I can link PlanG to it and the a/c appears correctly. However when I need to look at areas of the map away from the aircraft I click and drag the map ( with the link set to 'free') and immediately the whole screen goes black for a few seconds, as soon as I continue again it blanks the screen. I have had my computer in for repair as I imagined it was a hardware problem. It has checked out with no problems.Can anyone out there help me please - I am becoming so frustrated I feel some days I should just forget about using Flight Simulator altogether. :(