The information in this Reuters article isn't directly related to radio,
but the subject matter might explain the more noticeable absence of that
country's shortwave stations from time to time. A whole bunch of
frequencies were dark last night, for example.
"Havana announces blackouts, cancels carnival as crisis deepens"
https://www.reuters.com/world/americas/havana-announces-blackouts-cancels-carnival-crisis-deepens-2022-07-30/73,
Ricky Leong
Calgary, Alberta, Canada(via WOR io group)
http://www.hard-core-dx.com/article.php?story=20220730161502259