Watch turned off and is very hot

My Vivoactive 4s is only a year old. It has always been fine for running, cycling and swimming. 

This afternoon, 30 mins after a pool swim, it suddenly became very hot on my wrist and had turned off. It's on the charger now and I cannot turn it on. It feels really hot. 

Any ideas??? Feeling pretty disappointed. 

  • My 18 month old Vivoactive 4 was charging yesterday then got hot and went completely dead. Cant get it to restart even when plugging into either a charger or laptop and holding start button for 30+ seconds. Have been waiting on Garmin customer service phone lines today (both the 1800 number and the Sydney landline) for over 40 minutes each and still havent been able to speak to a human. Great way to spend your birthday. Not happy, Jan!!!!