fs9 crashes at its whim

Hello,
Recently, FS9 has been giving me some trouble. It's crashing very unexpectadely. For example, the other day, I opened up the flight planner, and it exitted itself. Right after that, I reopened the sim, went to flight planner and everything worked fine. Today, I was climbing enroute in an IFDG a321, and the sim went black. All I could here was the sound of the Aircond packs. It's very strange. I think it could be from the a321 panel that I have downloaded, but that doesn't explain the flight planner incident. Has this happened to anyone before?