This is a good question, because I'm not sure offhand if any of the ones which failed were the 3B+ with the new heat spreader on the CPU. I suspect they weren't

This is a good question, because I'm not sure offhand if any of the ones which failed were the 3B+ with the new heat spreader on the CPU. I suspect they weren't, as that model only came out a bit of a year ago. I _have_ had overheat issues with the updated 3B+, though it usually involves 720P video and/or an active RTL-SDR dongle. That's somewhat to be expected given the power draw and processor demands of such.