@Stefano I wish. A refund wouldn't have been enough. The repair was $20 (I already had the board out, I just took the button and board in and had it soldered), and was "no warranty/guarantee" for the repair. 😕 Needed a new phone after that, and $20 wasn't about to buy a newly working Nexus 5. So I ended up buying a Pixel (which was another adventure in suffering), after which the suffering led me to getting an HTC 10. So now I just use the N5 for testing UT stuff, but without network or bluetooth.

@ChaoticBeard It seems like that could happen, if the button is getting stuck in the "pressed" position somehow. It's possible there could be a software issue, but whenever someone posts one of these threads, it always seems hardware is most likely cause.