X-H2s overheating after about 30 minutes into 4k recording

[coderemover]

Well, that's a bummer. I wanted to record a full concert, about 1+ hour long, piece by piece.
In many articles they stated that H2S can record 4k/60p for about 240 minutes at temperature 25°C.
I recorded in air conditioned room, temperature likely less than 25°C, probably between 21 or 23°C.
Yet to my surprise, about 15 minutes into recording the camera displayed a yellow warning about getting close to the thermal limit and in another 10-15 minutes the warning changed to red.
Then it didn't allow me to start the next recording until it cooled down.

So there is a huge discrepancy between what was promised and what I observed. I guess maybe I did something wrong with the setup.
Besides doing the obvious like buying an additional accessory fan, are there any things in the settings I could make to reduce the heat production, without reducing quality to FHD?

My settings were:
4k/60p, compression h265, LongGOP, color 4:2:0, bitrate 100 Mbps, recording to SD card.
 

Edited July 23, 2023 by coderemover

[man-overboard]

My first reaction would be to buy an CF Express B card and record to that video. I have that camera and I record video to the CF and stills to the SD. I have had no problems BUT I have not done more than 5 minutes video in one go. Your settings seem OK.