Just tested this with a brand new unit purchased December 1st week. Minus 11 on my area with a bit of wind. My first steps out the building, the tap and hold to cancel noise cancelling kicked in. Restarted the device and no more issues until further 5 minute of the rest of my walk until my destination.
Went in a store, still have headphones on, and no issues after the sudden change in temps.
After another 5 minutes inside the store, I checked if all touch controls are properly working and they're all fine. Went out fack in the cold and after a few steps, tap and hold for Google Assistant randomly kicked in. I said "what's the weather" and responded properly. No more issues after that on the rest of my walk, until I got inside to my desk.
I would say that, unfortunately, I found this normal. I had a few touch controled headsets/headphones from other manufacturers and cold temperatures make the same issue on those units. Those are not "Sony/Bose priced" units, but they also have the limitation on low temperature. Some confirmed that the previous generation (1000xm2) did not have this. Too bad that Sony did confirm this is a flaw and nothing they can do about it. I like the headphones, really, so I'd absorb the expense and this issue.
In my situation, it seems like the first sudden change from warm to cold temps triggers this issue, then it won't occur again after I entered somewhere warm and go out again. I am a regular commuter, with walks of about 15 to 30 mins in total everyday (bus stops and picking up the mail).
Though disabling the touch controls on bluetooth and wireless functions would be handy if Sony can implement.
