Garmin,
I know the company is in it for the money, but not addressing known issues for those who are already customers isn't the way to keep people loyal to your products. There is clearly a known issue causing the Vivoactive 4 to shutdown sporadically and it appears you refuse to answer the mail. Why don't one of your techs explain how to fix this issue? I'm sure it involves going into the watch via a Windows based computer to manually revert the bad version of software that is causing the problem. Soft and hard reboots don't work, clearing data doesn't work, and completely resetting the watch doesn't work. Help your customers enjoy your products!!