My kids got a yoto this christmas, (I have no warrenty as it was an elderly family member that bought it on Amazon). Anyway they're loving it but we ran into a problem with the headphones jack, using childrens low decimal headphones the sound came out no problem yesterday on our first use, but today they won't work. Tested several pairs of headphones and it is only the yoto that can't play sound. Anyone else having an issue?