I have got the Blue Triangle of Death today. Was scrolling through my morning report and the watch crashed, just showing the blue triangle. I completed a hard reset (turning phone off by holding the Light button, then turning on by holding the Light, Start/Stop and Back buttons simultaneously, letting go of the Start/Stop button after the first beep, and then letting go of the other two buttons after the second beep), and this allowed me to restart the watch and sync.
However when I tried to go into a suggested run, the watch crashed again. I got around this the next time I rebooted by ignoring the suggested workout. This worked for 10 minutes, after which I was in changing a few settings and my watch just froze and I'm back to the start again.
I've contact Garmin support who say that this isn't covered under warranty (basically too bad, so sad!), and my email address has been added to a working list and they'll let me know when the issue is fixed, but there is no timeframe.
I see in previous posts that this issue isn't a new one, with some people reporting it 3 years ago, so basically my £300 watch, which is only 6 months old is useless (just like the customer support I've received!)
**Update**
So I went through the hard reset process again. Got everything set up and then immediately switched off the watch (long hold light button). Left it off for half an hour and then turned it on. Immediately went into a treadmill run and it has let me complete the run (47 mins) so there may be a patch out to fix it. I'll update again if the triangle returns
