I have had this on and off for a while. It started with the early 3.x firmware and was still happening with 3.11.0. I can't remember seeing it for a few weeks, so it might be fixed in 3.12.0.
I have never worked out what triggered it. But, restarting didn't seem to have an effect. Removing the affiliates file sometimes seemed to fix it. Generally, after a few days, it seemed to fix itself.
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