Files after upload damaged

Anybody know this problem?
It happens from time to time that clips are damaged after upload here and only 1 or 2 seconds are visible.
This just happened with a upload of 8 clips in following row what's realy time consuming!

Does it belong and happen when P5 servers are too full and too much uploads are waiting,
or my it be the PC system reason when Windows or any other software checks or try update installations while uploading the clips is working?

I upload just audio files but I've never had this problem. (I'm using WIN7).

I speak about only video clips, forgot to note this.

I had this happen aprox 1 year ago. Support tried for several weeks to find the reason with zero luck. Even when they downloaded the clips via Drpobox, and played them back locally on their computers, all was fine, but no matter how we encoded the files and uploaded to the system, they got trashed.

Hmmm.

I had quite a few rejected by other because of interlaced, in fact they were shots of progressive clips, using tripod and no panning. So I don't know who is wrong, may be in between, or the technology is not as perfect as what we expected to be. Strange...