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IIRF works only when IIS Site logging is enabled
This has happened to me of multiple sites: if I disable site logging IIRF starts to fail. 95% of the time I get page not found and every once in a while IIRF will catch a request. I've tested this theory very well and I am positive that this is the case. When this happens IIRF does not log anything, as if requests are not even reaching it. I can give you more details if you tell me what are you looking for.
At first I though that the sites in IIS are getting corrupted somehow so I started recreating them. As soon as I did that IIRF would start working again, until I saw a pattern where I would disable site logging and IIRF stops working.