I have a Mini in the kitchen (bought when it first came out, in 2020), that in the last two weeks developed, out of the blue, a quite severe case of ghost touch, that also causes it to enter in a reset loop every few hours. The speaker is perfectly functional otherwise, but unfortunately, you cant disable the touch panel completely via software.
A pity.
I´m currently waiting for the release of a new model before buying one again.
PS: Also, now every time that I unplug it from the wall and plug it back in, the red light turns red because it believes it is being touched, and after a few seconds it resets itself.
I can stop it by holding the entire palm of my hand over the Homepod a few seconds; after that the light turns to white, but from that moment it will raise and low the volume on its own or randomly pause the content that you play on it, and after a few hours (usually at night), it will eventually reset itself again.