I have been using SC for years and for about the last year (maybe a bit longer) I have been running into all sorts of weird syncing issues.
Very regularly songs that I like or add to playlists will be unliked/unposted and/or removed from the playlists I add them to.
Also artists that I follow will be unfollowed on their own (I have tried following one of my best friends on SC about 15/20 times now and it always gets undone . . no exaggeration).
It seems to be an issue when switching use of SC between the mobile app on my Galaxy S4 and my computer.
Really hoping to get this cleared up because I know that there are tons of songs I have liked and artists I have followed that have been completely lost to me.