There have been 2 recent upgrades for this model, the first dated 04.09.22. SW version 1.05.86.
1. New video drivers installed.
This upgrade caused my receiver to have missing sound on some channels, including streaming channels.
There was a second upgrade today
15.09.2022. SW Version 1.05.87
1. CLAP Online TV installed.
2. T2MI manual input installed.
3. Built-in quick input for XT.
This appears to have fixed the missing sound problem.
CLAP Online TV is a French streaming service.