Kodi v21 and Fen on a Nokia Streaming Box 8010 – Weird video behaviour

I have a Nokia Box 8010 with Kodi v21 and Fen with AllDebrid-RealDebrid installed. Yesterday when I played a DV movie, it started, then rewinded to negative whatever on the timestamp, then buffered, then black-screened when I paused it, etc. I tried another without DV, thinking that was the culprit and it happened just the same thing. I tried to change the buffer settings, with no luck. In ATV 10 directly on my TV which has also installed Kodi v21 and Fen addon, everything is ok. Any ideas?