I want to share my experience in regards to my Philips TV.
1- If I change my picture sittings and switch the HDMI input to another device.
2- And then go back to the original device, it becomes very bright. (While the numbers are same of picture settings)
4- I have to manually enable then disable the PC mode to get the good colors like before.
3- Found the option " Adaptive Luma Control " Disabled should be (Low) to keep the configurations/brightness or to force the values instead of (disabled) after switching inputs.
I think it is software bug
I have the PUG 7406 (Brazil) in other countries it is the PUS 7406.
Using my Xbox I had two problems, any content that uses Dolby Vision be it game or video causes the option to change Backlight intensity to not work properly, only working again after restarting the TV.
The second problem occurs when I use a headset on the Xbox controller, if I keep it in use for a long time, the TV is muted when I unplug the headset, only returning to normal if I restart it.