OK, now I understand what happened.

Because I was ABSOLUTELY sure there was impossible (!) that I could have not upvoted even one single POB-based post in whole 24 hours. I do POB manual curations EVERY DAY. No exceptions.
This triggered my alert.
Seeing that rewards for other curators keep rolling in (hence - HiveEngine keeps working OK) , but not to me - it brought in a false prediction that my mute has happened.

Somehow I got an impression in my unconscious, that rewards should arrive 7 days after upvote was done.
Obviously, it is wrong, reward comes after original curated post expires after 7 days it was posted. It may arrive to curator even after a few hours upvote was done.
Keep this in mind, curators.

Just by accident all that day DECEMBER 19 I was upvoting posts which all were not new, but much older. So my DEC-19 upvotes were all already paid earlier, before DEC-26. Once the original posts expired.

Strange, false, and a bit funny situation.

At the same time it shows, that I am doing my curations every day under the constant stress, that this 100% anonymous POB founder may take radical sanctions against me, his worst competitor, at any time.