I don't think my case for my galaxy buds is holding a charge properly. I only ever use the buds for an hour or so at a time, and when I'm done the buds are still at a high percentage, like 90-95%, which is great. But when I put them back in the case the battery depletes so quickly that it goes from green to yellow to red in like 2 charges from 90-95% to 100%. Is this normal? I thought it was supposed to hold 7 hours.