When the right earcup is open, the pairing begins, and if you turn the earcup slightly inward, only the right voice will be cut off, and if you turn it a little more, the Bluetooth will be disconnected. When you install the headphones, the pairing is unpaired from the iPhone.
In this case, is it a problem with poor contact of the hinge hardware?
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It sounds like debris on the headband contact pin connecting the left earcup to the right earcup.
Try removing the headband using a SIM ejector tool (This can be found under the ear cushions)
When you pop off the band, the band has what appears to be lightning-like contact pins. Clean those with isopropyl alcohol wipes and reinstall them.
Hope that helps!
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