( I've just been treated by the Logitech chatbot as a complete incompetent moron, and it won't let me file a bug-report with them, unless I open them to even more such abuse, through email, so fsck 'em.
YOU get to see the bug-report, but if Logitech never sees it, that's their problem.
I want suckers who bought this expensive keyboard knowing what it's doing, however, and that requires the correct description be findable on the 'web. )
Sometimes after bluetooth powerdown, or switching either the tablet or keyboard off, it becomes impossible to reconnect to the tablet..
The device-button which is supposed to be connecting the keyboard to the tablet, can't..
Accidentally, I discovered that it had .. reconnected to my phone, while failing to reconnect to my tablet, but the device-button for my tablet was the one lit-up..
So, either
-
the phone & tablet are confused, and are scrambling-up their identities, re bluetooth pairing, so that the phone's using the tablet-credentials to connect, and the tablet then can't connect to the keyboard, XOR
-
the keyboard's confused, and is using its device-1 memory-stored-settings for device-2
I don't know which is the case, and have unpaired it from my phone, completely, but this bullshit is still happening.
I've had to re-pair the damn thing to my tablet about 2 dozen times in the last month, and it's fscking annoying.
IF you're encountering problems with your Logitech K780 wireless keyboard fucking up,
open up your other devices, and get apps up you can type into, to see if the damn keyboard is pretending that it's trying to pair to the proper device, but it has already paired with another of your devices
Nothing on
https://support.logi.com/hc/en-za/articles/360023182654-K780-keyboard-does-not-work-or-loses-connection-frequently
is correctly describing this effect.
Let the world know the truth, in spite of Logitech's blocking of the correct information.