Thank you for the answers. The software and firmware are up to date. So, after poking around, I found out that standby and operation run in sync with the way operation is set.

It takes a while for the display to dim in standby, so you have to wait a moment to check that the settings are correct.

Hello Thunderwave, try setting it to medium in operation, leave it in standby, if it works, set it to high again.
Otherwise, carry out a software or firmware update. If this does not work. Defect.
Greetings Alex