The issue, says Google, was that the button on top of the device was faulty and would sometimes activate on its own. In response, Google acknowledged that this bug affected a small number of units, and issued a software update that would disable that button entirely, for all users, while it explored a long-term fix.
This entire episode is an embarassing for Google, as it grapples with Apple and Amazon to conquer the small, but growing, market for AI-powered voice assistants.
We have made the decision to permanently remove all top touch functionality on the Google Home Mini. As before, the best way to control and activate Google Home Mini is through voice, by saying 'Ok Google' or 'Hey Google,' which is already how most people engage with our Google Home products. You can still adjust the volume by using the touch control on the side of the device.