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The white thermal temperature warning icon (while taking stills)

This isn't an R5 thing specifically, that same warning appears in the manuals for the 5DIV (Page 331) , 5DSR (Page 277), 7DII (Page 310), and probably others I haven't yet checked.

Unless you've managed to trigger it on another camera in the same conditions, I don't think it's worth worrying about with the R5 specifically.
 
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This isn't an R5 thing specifically, that same warning appears in the manuals for the 5DIV (Page 331) , 5DSR (Page 277), 7DII (Page 310), and probably others I haven't yet checked.

Unless you've managed to trigger it on another camera in the same conditions, I don't think it's worth worrying about with the R5 specifically.

Ditto. After reading what some folks have put this camera through I’m 100% satisfied that my normal usage won’t be a problem.

One guy here (name escapes me) rattled off 1,500 shots in less than 5 minutes after several other similar buffer bottoming ‘torture tests’ in 85 degree weather. No problems.
 
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