I realize this is an older question, but in the interest of making the information available. I believe this is the NFC antenna and would absolutely make sense as to why it might have been malfunctioning after power button issues since it sits in that same area. I know the upper cowling on the XR is also a bit fussy because of the little grounding clip which also screws into one end of the antenna.
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Also, in my experience bluetooth and wifi are much more likely to share an antenna or other hardware because they both operate on 2.4 GHz, so I would be less likely to think it’s shared between NFC and bluetooth. Especially since NFC operates on a much different frequency (13.56 MHz). [br]
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