Apple Watch Series 6 screen stuck on temperature warning after swimming

My series 6 watch started overheating when I was on holiday, it did not feel hot but the warning came up anyway. It was left in a cool room for 3 days, the warning remained there. (even placing it in the fridge for a day)

I have tried to reset which is when it came up with the charging symbol but will intermittently switch between the charge and the temperature warning.

I was having a swim at the time, water lock was on and workout for outdoor swim and then the screen started to freeze and the temp warning came.

it has been 5 days, any advice is greatly appreciated :)

[Edited by Moderator]

Original Title: apple watch 6 stuck on overheating screen