I run a pdf manual store, so I sell manuals. everything works great, but the last 2 weeks I have been getting complaints that the files being downloaded are corrupt, not everyone, just a few. Maybe 5 or 6 times in the last 2 week. There has been maybe 20 files sold in the last 2 weeks, so its only about 1/4 of them showing up as corrupt.
I have checked them out on the server, and the files are fine, so it has to do with the downloading. I had a customer buy a manual last night, and he called me this morning. He said he downloaded the manual 5 times last night, each time it said the download was complete, but when he tried to open the pdf file he was told the file was corrupt.
He is using IE8. I had him try it again this morning, and it downloaded correctly, and opened fine. I have checked the Apache error log, and the access log, but there are not errors logged.
This site has been up for the last 5 years, and I have only seen this problem maybe a couple of times, but in the last 2 weeks it happened 5 or 6 times. I'm not sure if this is a Server problem, or a Xcart problem. (that is my e-commerce program).
I have left a simulator message on the Xcart Forum, to see if anyone else has seen this. I am also going to start to keep a log of of operating system, Browser version, and internet provider to see if I can see a connection.
Do you have any other Ideas to try, I'm open to suggestions.