I have also posted this issue on the SteamOS GitHub, but it might be more appropriate here.

Your system information

• Steam client version: 1708129125
• SteamOS version: 3.6
• Opted into Steam client beta?: Yes
• Opted into SteamOS beta?: Yes
• Have you checked for updates in Settings > System?: Yes

Please describe your issue in as much detail as possible:

If you have played a game for a length of time (two hours or more, but it seems random), pressing either the Steam button or quick access button (...) while in game will not open the applicable menu on the first press.

You can hear a menu chime sound, which suggests that the press has registered, but nothing will appear on the screen.

A second press of either the Steam button or quick access button will then open the menu. It will continue working reliably until the buttons are not used again for a couple of hours.

This bug is reproducible in stable, beta, preview, and main update channels.

Many other users have reported experiencing this issue:

E.g. https://www.reddit.com/r/SteamDeck/comments/17913xs/am_i_the_only_one_whose_stream_button_and_menu/

https://www.reddit.com/r/SteamDeck/comments/164dcc8/need_to_press_steam_button_twice_to_open_menu/

https://www.reddit.com/r/SteamDeck/comments/18n100s/i_have_to_press_the_buttons_on_my_steam_deck/

Steps for reproducing this issue:

1. Play a game for two hours or so without pressing the quick access button or Steam button
2. Press either the quick access button or Steam button
3. Neither of the menus will open on first press, but you will hear a menu chime sound
4. Press either the quick access button or Steam button again, and the side menu will pop up.