iPhone 15 Pro Max freezes when filming ProRes 4K60 with external SSD.

I have an iPhone 15 Pro Max, and it connects to a SanDisk Extreme Pro Portable SSD 2TB (2000MB/s R/W)via USB-C cable, provided by SanDisk.

I can film ProRes 4K30 directly to SSD without any issue. The problem comes when I switch to 4K60, and press record, it appears to be recording, but when I want it to stop, the whole iPhone freezes. The only thing I can do is quit the default camera app entirely, back to the main menu and screen operates again, but the phone won't be able to recognise the SSD, neither in camera app, nor in Files or any other apps.

I plug the SSD to my Mac, I can see the folder, and the video files I just created, but the 4K 60 file is corrupted and cannot be played. I had to delete the corrupted file, and plug the SSD back to iPhone, it will then recognise the SSD again.

I've tried and tried many times, and this problem never goes away.

Very frustrating...