Alexander Us

I've found what is cause resetting HDMI input names to default.
It seems it's some kind of a feature of Apple TV 4 and HomeKit.

If you added your TV to Home App it will set its own names for HDMI inputs over CEC protocol.
Here is the reddit topic: 

 

Removing TV from Home App resolve the issue.

Hope it helps somebody to close the gestalt and set everything to work as intended.
Good luck!

I have the same issue with my LG B8 55 (OLED55B8PLA).

After some time TV starts resetting input HDMI names. Not all at once, but step by step.
I'm using 3 inputs: ARC for the soundbar, Apple TV and TV box from internet provider (Vodafone).
Also USB flash drive is always in TV.
I can't figure out the logic behind resetting and I'm sure that this is a bug.

Did someone try to reset the TV to factory settings? Does it help?