I have had this problem for a while where my 245M crashes. It's always on starting an activity (usually a run) and with the music loaded and playing through BT headphones.
It's done this a few times and you get the blue triangle of death - normally switching on the power again restores everything but today it did this and WIPED EVERYTHING.
MUSIC GONE, DATA GONE, EVEN WATCH FACES I HAD DOWNLOADED.
Now I've got to reload all my music again - not impressed.
