Recently I purchased some Zolo Liberty headphones. They were working fine all day, I charged them to full, used them, came home and noticed the charging case LEDs were blinking. I had no idea what was going on but I figured it wasn’t anything big. I put the headphones into the case and came back a few hours later to find they weren’t charged. The 3 LEDs on the front of the charging case keep blinking and the headphones charging lights don’t turn on when I put them in the case. Not sure what to do with the case? I don’t want to return them as I really like the sound on them, but I would also like my headphones to be chargeable. Anyone else have this issue?