Good day Andy.
The first one is the closest. It occasionally shows up when I do one of the three things I mentioned. I can definitely assure you that I did not, in any way, nudge the volume adjustment wheel whenever I experience this. It is kinda difficult for me to send a video proof as it occurs when you least expect it. I'll post it here if ever I caught it on cam.
I also want to add another observation which I forgot to include. This has something to do with the clock and the cover art
-Missing Clock-
I'm always on Audio Priority Mode since I only listen to my music collection and not with any streaming services like Tidal or Spotify. There are times that I notice that there's no clock on the main screen. It is present on the lockscreen but after you have unlocked the unit, it doesn't display the time. To be honest, I haven't read the manual but is this one of the functions when the unit is in this mode? Below is a pic for your reference.
-Cover Art-
I am kinda O.C. with it comes to my audio files and I make sure that the information within them is complete and uniform. Items like album covers, year published, etc. are present in each file that I have. There are cases when I go the tab after Music, which is Album, It'll show all the albums (with its cover art) available for me. But when I start playing the song, the album art shown is the Cayin Default album art. This will be the same for all the albums. This happens even if I didn't do any changes on the storage, say adding or deleting albums. What I do to remedy this is to have the unit re-scan again all the songs and have it restarted. After some time, like a day or two, It'll happen again as if I have removed all the album covers from all the files.
I really like this unit and I like the fact that it sounds great and can do many things for an affordable price. I hope that this gets to be improved on the next FW versions.