Unexpected system restarts every 1–2 hours after latest SteamOS 3.10 update (build 20261104.1000)

Start by comparing boot history and the previous boot's journal, which the report says ends without a normal shutdown sequence. Check whether the foreground_booster crash occurs before the full restart; the issue provides its stack trace but no cause for the system restarts. Done means identifying a reproducible cause or collecting evidence that narrows down the restart trigger.

Your system information

Description

Since updating to SteamOS 3.10 this morning (November 4), my system unexpectedly restarts every 1–2 hours during normal use. Boot history confirms multiple full system boots. The previous boot's journal ends without a normal shutdown sequence; the cause is still unknown.

Occasionally, a foreground_booster crash report appears afterward. Logs show it fails to connect to Wayland during login, then automatically restarts successfully. This matches https://github.com/pixelcluster/kcgroups/issues/5, but there is no evidence yet that it causes the full system restarts.

Crash report

           PID: 2738 (foreground_boos)
           UID: 1000 (deck)
           GID: 1000 (deck)
        Signal: 6 (ABRT)
     Timestamp: Wed 2026-11-04 19:26:22 CAT (1min 2s ago)
  Command Line: /usr/bin/foreground_booster
    Executable: /usr/bin/foreground_booster
 Control Group: /user.slice/user-1000.slice/[email protected]/background.slice/plasma-foreground-booster.service
          Unit: [email protected]
     User Unit: plasma-foreground-booster.service
         Slice: user-1000.slice
     Owner UID: 1000 (deck)
       Boot ID: 35a8c913fd8640b1a3fdcaa7217ca8c7
    Machine ID: 8cebc833ab534337ac5925fe4205d924
      Hostname: steamdeck
       Storage: /var/lib/systemd/coredump/core.foreground_boos.1000.35a8c913fd8640b1a3fdcaa7217ca8c7.2738.1793813182000000.zst (inaccessible)
       Message: Process 2738 (foreground_boos) of user 1000 dumped core.
                
                Stack trace of thread 2738:
                #0  0x00007f486b29a11c n/a (libc.so.6 + 0x9a11c)
                #1  0x00007f486b23e5d0 raise (libc.so.6 + 0x3e5d0)
                #2  0x00007f486b225685 abort (libc.so.6 + 0x25685)
                #3  0x00007f486ba99bfe n/a (libQt6Core.so.6 + 0x99bfe)
                #4  0x00007f486ba9a369 _ZNK14QMessageLogger5fatalEPKcz (libQt6Core.so.6 + 0x9a369)
                #5  0x00007f486c3b228b _ZN22QGuiApplicationPrivate25createPlatformIntegrationEv (libQt6Gui.so.6 + 0x1b228b)
                #6  0x00007f486c3b38c8 _ZN22QGuiApplicationPrivate21createEventDispatcherEv (libQt6Gui.so.6 + 0x1b38c8)
                #7  0x00007f486bb8ee15 _ZN23QCoreApplicationPrivate4initEv (libQt6Core.so.6 + 0x18ee15)
                #8  0x00007f486c3b39cb _ZN22QGuiApplicationPrivate4initEv (libQt6Gui.so.6 + 0x1b39cb)
                #9  0x00007f486c3a92ae _ZN15QGuiApplicationC2ERiPPci (libQt6Gui.so.6 + 0x1a92ae)
                #10 0x000055aeb9e931b2 n/a (foreground_booster + 0x31b2)
                #11 0x00007f486b227781 n/a (libc.so.6 + 0x27781)
                #12 0x00007f486b2278b9 __libc_start_main (libc.so.6 + 0x278b9)
                #13 0x000055aeb9e93e55 n/a (foreground_booster + 0x3e55)
                
                Stack trace of thread 2820:
                #0  0x00007f486b2a08f2 n/a (libc.so.6 + 0xa08f2)
                #1  0x00007f486b3119d7 ppoll (libc.so.6 + 0x1119d7)
                #2  0x00007f4869fadc9e n/a (libglib-2.0.so.0 + 0x6ac9e)
                #3  0x00007f4869faddb5 g_main_context_iteration (libglib-2.0.so.0 + 0x6adb5)
                #4  0x00007f486bec4d22 _ZN20QEventDispatcherGlib13processEventsE6QFlagsIN10QEventLoop17ProcessEventsFlagEE (libQt6Core.so.6 + 0x4c4d22)
                #5  0x00007f486bb96a74 _ZN10QEventLoop4execE6QFlagsINS_17ProcessEventsFlagEE (libQt6Core.so.6 + 0x196a74)
                #6  0x00007f486bcc4a02 _ZN7QThread4execEv (libQt6Core.so.6 + 0x2c4a02)
                #7  0x00007f486a369781 n/a (libQt6DBus.so.6 + 0x38781)
                #8  0x00007f486bd78fdb n/a (libQt6Core.so.6 + 0x378fdb)
                #9  0x00007f486b298042 n/a (libc.so.6 + 0x98042)
                #10 0x00007f486b32072c n/a (libc.so.6 + 0x12072c)
                ELF object binary architecture: AMD x86-64

Steps to reproduce

1. Update to latest SteamOS 3.10.
2. Use the system normally for approximately 1–2 hours. No specific trigger identified yet.
3. The system restarts unexpectedly; the crash report above sometimes appears afterward.

Expected: the system remains running without unexpected restarts.