When I download a game, pc restarts + no sound

[Windows Server]

Hi to everyone who is going to read and help me. I have recently upgraded my pc and installed windows 11 (clean installation). This my hardware: Asrock Fatal1ty AM4 X370 Mini itx wireless ac - Bios 7.40 (the latest)Onboard Realtek audio chipset with the latest driversRyzen 7 5700X3DDD4 32 Gb G.Skill trident (2x16Gb) 3200 MhzRadeon Rx 7800 8GbPsu Silvertsone 750 wattThe pc is connected via HDMI cable (a high end one) to Onkyo AV receiver TX NR6100. Speakers: 2. Onkyo is set as a 2 speakers' configuration. Since I started using Windows 11 I have the following problems: 1) when I download a

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