my issue with the one i have (k2, iirc) is that if i use it wirelessly and the battery dies, it becomes a brick until its been fully recharged. it won't even work as a wired keyboard until then. so ever since then i only use it wired.
seems like there's a workaround but obviously far from ideal.
edit:
actually this may be the one I remember seeing at the time: https://www.reddit.com/r/Keychron/s/Dewr2dbVNX
"For anyone finding this thread like I just did, all it took for me was plugging the keyboard into a usb 3.0 slot"