a song is randomally not available in my country

i have ipad air 2 with some nice playlists on it, created from CDs which i own. i used to play the songs and all worked fine, until lately, where i counldn't - i get the names of the songs greyed out, with error message saying that the song is not available in my country.

i tried to follow on various guides on the net. from resynching, restart the ipad, updating the ipad, re authorized the computer which i sync the songs from. it seems that some of the songs are ok now, but others not. with every correction, a random songs are greyed out, and others are ok, and with the next 'correction' - some are greyed (even those that were'nt grey before). this is very strange.

no change has occured on the playlist or songs....