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R5 rebooted this morning, first time in three months, 300mm f2.8mkii +Sandisk 64gb 300mb/s 

Try the SD card only and see how things go

I have shot over 3000 images over 4 days last week, and my R5 is ok despite having the same freeze issue intermittently over the past few weeks. The only thing I have done different is not use the CFexpress card just my Sandisk SD 64GB 300mb/s card. ...

My freeze /lock up/ reboot has occurred when taking photos using various lenses , 300mm f2.8 mkii, 500 f4 mkii ,RF 70-200mm f2.8.

I use Sandisk 128gb cards, 300mb/s SD card and CFexpress read write 1700/1200I dont have any noise reduction settings selected in the cameraI have a downloaded copy of the user guide Many online reports from users including  R6 , not just  R5  owners...