a 6ya expert can help you resolve that issue over the phone in a minute or two.
best thing about this new service is that you are never placed on hold and get to talk to real repairmen in the US.
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goodluck! Maybe a new charging cable or the battery or battery port in the phone is going bad.
If you need further help, reach me via phone at https://www.6ya.com/expert/dave_641d453707669356