It stopped alone (I did not have to do anything else other than wait ~1/2h). I started it and seems to work.
So, for me there's no problem, now.
Nevertheless I still want to raise the alert for the AWS crew to review if there's any HW problem that might affect other AWS clients.
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EC2 instance stuck stoppingasked 2 years ago
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instance stuck in "stopping" stateAccepted Answerasked 10 months ago
Instance stuck in Stopping state.asked 3 years ago
Instance i-030d334a44bbd4b8e stuck at stoppingasked 2 months ago