Millers' Photography L.L.C. wrote:
I am finding dng image files are corrupting.
To give a broader answer, any sort of unchecked soft error in the system(s) data paths can cause this sort of issue. Often a system will seem to run fine, even when there is such an issue in its memory or storage system, but problems will show up with larger data sets. [The very first IBM compat. PC I bought had such a problem. The hard drive was mounted over the motherboard, and itturned out that RFI from the motherboard was corrupting some unchecked data path in the hard drive electronics. I tracked it down by writing some scripts to create large files and then checking their contents. Putting a metal shield over the hard drive electronics fixed that particular problem.] See <http://en.wikipedia.org/wiki/Soft_error> Graeme Gill.