500 Internal Server error on multiple websites to update plugins

I have several websites I am managing, it worked for awhile to update plugins, then today, I have quite a few that get this 500 Internal Server error when trying to update plugins. I went in to do them individually from the WPMU Dashboard and get the same error (so that I know it is not from trying to do a batch update). How can we resolve this error? Otherwise it defeats the purpose of having this dashboard if I still have to go into each one to manage the plugin updates there.