Fenix 8 AMOLED frozen on blue triangle

During the middle of my 160km race last weekend, my watch bricked — I am furious! Here I am, 5 days later, and all I see is the blue triangle of death.  It comes and goes — either I see a black screen or the blue triangle.  I can’t turn the watch off to reboot — it simply pops up with the blue triangle again.  I’ve tried to reset, but it never beeps when holding the three buttons — it only shows the blue triangle. Please advise.  I am beyond frustrated at this point.