Page Not Found Error when updating Plugins

Hey Everyone!

So I've been working on at work and I've started to notice something strange that's happening occasionally. I'm not getting to spend too much time in the back end looking around as I have a lot of other duties when I'm on the clock, but I'm concerned that it might be a larger issue in the future.

I've started to get a 'Page not Found' error when I'm doing some sort of update in the backend. This time I was trying to update the Google Analytics plugin and I got a very long response time and finally this page not found error.

I've also had this error come up when doing other updates in the back end, on the theme options page of iFeature Pro 5, for instance. I suspect that maybe a plugin is causing the issue, but it doesn't happen consistently enough for me to test it with any kind of time-efficiency.

Any ideas on what could be causing this?