I know get the “song is no longer encoded correctly” error message on every album / song in my library. I most typically use a streaming service, so not sure how long this has been an issue. However, 2-3 months ago for sure I could play all the songs I cannot play now. I have done the usual - restarted router, restarted Sonos devices, reindexed my library, updated all Sonos apps. All to no avail. Checked the community questions and nothing is popping as as the answer.
I can still play music from the streaming service.
Sonos and Pc are not in the same room, but they are close. My wireless signal is strong.