alarm

the alarm on my phone only works sometimes i choose a song from my library and then when i need to alarm to go off the song doesn’t play and i end up waking up late. it used to just play the default ringing sound instead of the song which was annoying but still woke me up but after the 15.1 update it’s now silent if the song doesn’t play. i’ve tried downloading the song and making a new alarm tab and every few months i would completely clear my alarms and make new duplicate ones but nothing seems to work. the silent thing only happens with some songs though so i know i’m not doing anything wrong because other alarm songs work just fine as they should