Severely frustrating, predominately use photo mode, as soon as video opportunity, switch to video mode 4K60, instantly overheat flashing, video mode unusable 99% of time. However, when testing out of housing, seems no issue. Any remedy? Suggestions?

I know that the well-known overheating problems with the R5 were fixed with firmware updates. They basically removed most of the first limits. It was quite embarrassing for them.

Here in the Mediterranean, I know people who use it only for video and have never had problems. What temperature is the water? What resolution and codec do you use?