NGX glitches

Hi Pmdg. After installing Hotfix release I still get my sim putting itself into pause mode, seems at least once a flight. Not sure how long I have been flying maybe between 20 minutes to 1 hour.Today I was flying, cruizing along and I decided to switch to real time weather. When I came back into the sim the screen just went black. There was sound and I could move my mouse but just black. Pushing the escape button then pressing continue did nothing. I then went to flight analise and when I came back the cockpit came back to normal but the scenary water was not there. I dropped back into flight analise again but when I came back the screen stayed black and had to exit the sim. I was also using an add-on livery the other day and fuse board behind both seats went clear so I could see outside, draughty to say the least. Anyway thought I would share that with you. Brett Nicholls