Is Spotify forgetting songs added to My Music?

[robot14]

I can't 100% confirm that this is happening, but it seems to me like Spotify occassionaly forgets songs that I've added to my music. Anyone else experiencing this? Maybe it's a problem with syncing my activities across my personal Mac, work Mac, iPhone, and iPad?

For example, I was just listening to this song: spotify:track:55rjnUeIps039RYieWCHDH. I'm pretty darn sure that I added it to My Music by clicking the "+" a while ago. But now I see it's not checked. I can confirm that song was already added to four differerent playlists of mine (Spotify told me so) - knowing my style, if I added a song to that many playlists, I'd definitely have added it to My Music as well. Can anybody shed some light on this?

Could a Spotify rep look at my db and confirm if this is happening?

[driveflanger]

Is the option "Sync over celular" turned on? Maybe what it's happeing is due to network disruptions, when you save a song during that time some songs are not properly synced to the other devices. That could be a reason.

[hans-jürgen]

You might have reached the 10k tracks limit in Your Music / Songs, do a search for this term, there are plenty of threads and ideas about it.

[robot14]

Thanks guys. @DriveFlanger, I'll try it. Sync over cellular was turned off on my phone. I guess time will tell if I experience the maybe-bug again. 

@hans-jürgen. I have 1,960 songs in My Music, so I've got some headroom. As others have said all over this site, it's a shame that there's a limit at all, but perhaps that a technical or contractual limitation. I'd love to be a PM at Spotify so I could understand what's driving the product features.