Your demands are quite high, so one or the other card might occasionally go down the drain. Basically, I have been using these cards for over a year and have had no problems with them, no noticeable heating or malfunctions. There may be better cards for high-end requirements, but they cost several times more.
As I said, I am very satisfied with these cards.

I use these cards in my Z9 to record 8K 60fps raw, and never had a single issue with any of the two cards I own. They do tend to get hot, but the other CFExpress cards I have also get hot when recording at these rates/fps. You may want to try and update the firmware of the card though, this may help (https://www.angelbird.com/downloads...).
It may also be an issue with the XH2S not having a good enough heat dissipation system around the cards, it's quite a small body compared to cinema cameras or a Z9. Many small mirrorless systems tend to have overheating issues when recording 4k50/60 for >45-60min unfortunately. This is when a dedicated camera with a better heat control system may come in handy.