Mux change history: Increased errors in playback

Mux reported a major incident affecting Mux Video - Live and Mux Video - VOD, with increased playback and thumbnail errors in one region. It started at 2025-09-18 16:37 UTC and was resolved at 2025-09-18 19:46 UTC, lasting 3 h 9 min; a fix was implemented at 17:23 UTC.