Randomly corrupted installers

We are developing a software suite called Omnitapps in Adobe AIR (sdk 4.5.1 build as 2.6) in FDT 4.5

Since a while now our installers we package with ant seem to get corrupted randomly, some times it works some times it doesnt.

It seems to get worse depending on how much data is included in the package, we have also noticed it usually breaks on our video files we included:

[2011-10-11:09:13:36] Bootstrapper begin with version 2.6.0.19120 on Win x86

[2011-10-11:09:13:37] Installed runtime (2.7.1.19610) located at C:\Program Files (x86)\Common Files\Adobe AIR

[2011-10-11:09:13:37] Launching subprocess with commandline "Adobe AIR Application Installer.exe" "C:\Users\max\AppData\Local\Temp\AIR6DAA.tmp\OmniTapps"

[2011-10-11:09:13:45] Application Installer begin with version 2.7.1.19610 on Windows 7 x86

[2011-10-11:09:13:45] Commandline is: C:\Users\max\AppData\Local\Temp\AIR6DAA.tmp\OmniTapps

[2011-10-11:09:13:45] Installed runtime (2.7.1.19610) located at C:\Program Files (x86)\Common Files\Adobe AIR

[2011-10-11:09:13:49] Validating app in folder C:\Users\max\AppData\Local\Temp\AIR6DAA.tmp\OmniTapps

[2011-10-11:09:14:19] Got an unexpected fatal error while validating native package: Error: The digest for Applications/OmniVideoDraw/videos/Demo_video_Discoverers.mp4 is broken

[2011-10-11:09:14:21] Application Installer end with exit code 7

[2011-10-11:09:14:21] Subprocess Application Installer failed (7)

[2011-10-11:09:14:21] Bootstrapper end with exit code 7

Our installer atm is about 570 mb, and we wonder if there is a cap on the amount of data included in a package, or incompatibility with certain types of files because of the compression method?

If we remove alot of content from the package, including the videos it seems to be alot more stable and gets corrupted a lot less frequently.