I keep getting a d3d9.dll crash after a few hours of flying, no matter where it is in the world. I have replaced my main texture folders and not found the cause. Any help would be appreciated

Did you apply the ATI shimmering fix that was posted a few weeks ago here?Cheers,JohnBoeing 727/737 & Lockheed C-130/L-100 Mechanichttp://www.sstsim.com/images/team/JR.jpg

not the dll replacements but I am using the different anti-aliasing. This happened before that, and I thought it was bad airplane textures but I went through the AI planes and couldn't find anything wrong. I've used the different checkers such as fs manager, ACA2005, etc. Sometimes it happened after a 10 hr flight, but now I can't go longer than 2 hours... what gives? I have the latest bios, sound, video drivers, all windows updates, latest dx, 9.1 patch