When I begin an activity on my Fenix 6s, live track and the associated safety features no longer work. I have ensured my phone and watch are connected and there is gps signal.
prompting my wife to get in the car to look for me.
Why she just did not call you? Or was there no phone signal either? In that case it would explain why the LiveTrack failed.
Didn't hear the phone ringing - wind in my ears + low volume on phone.
Your watch did not vibrate either? Then that may be the clue why the LiveTrack stopped working. There must be a functional connection between the watch and the phone for the Live Track to work. If the BT connection dropped, you'll have to troubleshoot it first. The connection troubleshooting guide pinned to the top of this forum may perhaps help you with it.
safety features no longer work
I sort of have the opposite issue. I turned off the Auto Start setting for my f7, but the LiveTrack starts regardless of the setting.