I have one site that crashes every time I try to do an Export Fullstats PDF. It's also not sending the weekly traffic reports - I assume for the same reason. I just don't know the reason. If I ask it to export, it sits there for a while, working, working, then says that the site didn't send any data and gives a 500 error.

It manages a CSV or XLS full stat export, or a PDF export of part reports (visits by user/IP, etc). I'm guessing it's a timeout issue even though the traffic numbers aren't high. And it can handle 2 days of full stats Export PDF, but not more. Other istes have no issues.