If you have other USB-micro devices, try your cables with them to rule out faulty or power-only cables.

I'd also reset the NVRAM

How to reset NVRAM, PRAM, SMC on a Mac | Macworld

One guy on Reddit wrote that he's actually buying the 7X literally only for the flashlight, with no plan to use the watch for anything else other than telling time  To him, it was worth $800 to have a flashlight always on his wrist and always available…

After several months, the problem appears to have resolved itself.  For what it's worth, I'm now on Garmin Connect Mobile iOS version 4.51.

Thanks Garmin for resolving this.

ctc

I'm sure that's true, but I definitely observed that the yellowish one barely had any solar charging capability, while the two red ones had easily 10-20x better solar charging ability.

It might just be a cooincidence, since after all I only have…

Using the Coros Vertix2 Meteo is fantastic.  No lag, has a full Always on Display mode, not those reduced quality ones, and doesn't eat at my battery at all.

Woher kommt die Gewissheit, dass es sich um Fahrenheit handeln soll?
Bei meiner 6s Pro wird gar keine Einheit angegeben. Man könnte gerade jetzt zur Jahreszeit zwar vermuten, dass einem Fahrenheit angezeigt werden, es werden aber Celsius sein, und zwar…

I'd ask for a refund.  There are many other watch faces in the store.