Sitecore keeps restarting!
I can't guarantee that this will solve your problem, but if you are seeing the same symptoms as I was, it's worth a look! After rebuilding my solution or doing an IISreset I was seeing Sitecore continually restart many times over the course of a couple of minutes (generating a new log file with each restart) with seemingly no clues as to the cause - IIS seemed to think some configuration had changed, but I couldn't see how! After a lot of digging, I found the answer was nothing to do with Sitecore at all - it was an issue with IIS under Windows 8.1. The following fix solved the problem.