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Bottom line, go back to the basics and make sure your FW is up to date, you're RS meter has a fresh battery (I don't use one and have my own set up that has never failed a MRC), and ensure that your sensitivity setting is correct. All that said, nothing beats experience.

That's sound advice, but, feels very much like what was being repeatedly recommended originally. Clearly sometimes one needs a helping hand.

FWIW - my RS meter works fine, has a good battery and I always re-check the weighting and sensitivity settings. SPL is 45-50 at Vol=87 during MRC.

Rgds,
Nick