Not all phones support all the bands (frequencies) used to enable 5g. Additionally, 5g deployment is fairly variable by region and it may be that your region is one with sparse coverage. Additionally, your phone may intentionally switch off of 5g to save power.
Edit: if your phone is less than a couple years old it may be a warranty issue for the heat and battery. (unless you got malware or something drinking power.)
Many moons ago, when I was a little kid there was a candy shop that made the best salt water taffies. If you could find something like that, I would suggest that. Maybe the local bakery?
I was wondering that. But I don't believe they track it that way otherwise I would expect all the categories to be this way instead of just the cpu features.
I suspect they just want someone to listen.
Don't do anything about it (unless they ask), just acknowledge their feelings.