Solutions:

1. It may be that the power of headphones and charging boxes are too low, try full charge.

2. Try rebooting the phone before pairing. 

3. It may be a problem with the version of the system. Try upgrading the headphones to the latest version. 

4. It may be a failure of the left headphone. It is recommended to find the official after-sale maintenance treatment. 

Notice:

Bang & Olufsen Beoplay E8 right ear is the mainframe, there is an indicator, boot charging connection will show different colors and states. When using headphones, the left and right headphones should not exceed 20cm, otherwise there will be a cut-off phenomenon.

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