wont play certain songs, and only plays the first 10 seconds of other songs

[user-removed]

lately, some songs will just not play. The song before might play fine or do the same thing, but it seems random which songs will work and which ones wont. Some songs also only play the first 10 seconds and then it will stop and not play the song at all, even if i skip it and go back to it. I tried to see if it was my connection on my iphone 6, but it happens on my songs playlist as well, where i have most of the songs downloaded. i just want to continuously listen to my music without constant interruption. PLEASE HELP!