Me too - I went for a long run, synced the watch to my phone, then jumped into the pool and then I saw a bunch of lines and I quickly climbed out of the water and the vivosmart HR has been dead ever since. Every time I've had a problem with it dying, I've hooked it up to the charger/fiddled with it and gotten it to come back, but this time, nothing.

I feel hopeful though because it has vibrated a few times and the light on the back comes on, and the screen, while black, occasionally shows some light, but no Garmin screen, nothing. I've tried rebooting, and I get that black light screen - is this hopeless? I've been swimming in this watch for a year, it seems odd that it would die now.