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No resting heart rate (RHR)

Recently I started using my FR235 again every day (and night), primarily in order to monitor my Resting Heart Rate. Today I noticed that instead of a valid value, I got two dashes "--". Also, the RHS history doesn't appear to have an entry for today (Wednesday) which is rather weird.

See the attached pictures. I am running the latest FW 4.20 and latest Hub 2.60. Anyone has had the same issue?