After multi-sport activity with manual switching of activity types you will always get a crash and reboot on FW15.32. That was reported already, here is another subsequent bug;
After manual soft reboot with power key (to break everlasting triangle of death) the watch behaved like there was no activity before crash, though I received a completed activity in GC, which I deleted right away.
In a few hours later I've noticed my watch couldn't measure stress level (recent movement notification and no stress history after the crash) and smartly decided to make a breathework. Which asked me to score the activity at the end (which is already fixed behavior, there should be no such questions since fw 14), so I guess the watch was still in the middle of my crashed multi-sport activity.
When I finished and saved my breathework the watch resumed measuring stress level.
Garmin-Laurie could you please forward this bug to development team, this looks like a serious flaw.