Songs and albums that ive liked have become unliked?

[D3athStorm57]

Ive noticed quite often lately that a lot of songs and sometimes entire albums that i've definitely saved and liked have become unliked.  Consequently i have to go back to the album or song and re-like it, but this worries me for songs and albums that have become unliked and i just forgot about, but wont be able to hear again on my liked playlist.  Is this happening for anyone else?