Since you fixed it, it’s been better, but it’s also been weird, the mp3 files seem to have something amiss with them. For me what has been happening is antennapod (the FOSS mobile app) will not let me scrub through the audio, including if the app stops for any reason it requires me to start from the beginning. While this doesn’t immediately sound like it’s a problem on your end, I also found that foobar2000 on my PC refuses to play these files. I’m not sure why, but I noticed VLC (which can play and scrub through these files) says they are in the opus codec, which from my very limited understanding isn’t compatible with the mp3 container.