Left side AirPod disconnect after 3,4 min on music and on call it disconnect after 10,20 seconds

i have first gen airpod's left side air pod disconnect after 3,4 min on music and on call it disconnect after 10,20 seconds if i put back on airpod case and instantly connect again it will work fine for 3,4 minutes on iphone it show's battery percent very high like 70-80%

[Re-Titled by Moderator]