Initially HTC said this was a defect that would only effect early batches of the grey handset, but the company has since confirmed that all future gunmetal grey One Mini 2s will have the silver volume key. (techradar.com)
Many find it too easy to open, possibly a result of some loose hinges in early batches. (brighthand.com)
We're still waiting on findings from Apple into the biggest early batch hardware issue affecting a few iPhone 8 Plus units causing the display to separate from the chassis. (pocketnow.com)