Direct answer
Unexpected sign-outs can be a crash, storage pressure, managed-session policy, account token problem or power interruption. Determine whether the whole device restarts.
What this covers
- The observed symptom matches this record
- Customer-accessible settings, connections and external components
- Diagnosis before reset, deletion or component replacement
What it does not cover
- ×A model-specific error code with a different documented meaning
- ×Internal electrical, battery-cell, gas, refrigeration or sealed-component repair
- ×A guarantee that every model exposes the same control label
Capture the exact symptom
ReversibleCheck uptime, crash notifications, free storage and whether the Chromebook is school/work managed.
Run the smallest isolation test
ReversibleTest Guest mode and another network; update ChromeOS and remove only the extension proven to crash the session.
Correct only the proven cause
ReversibleResolve the account or administrator policy if Guest stays stable; back up Downloads before Powerwash.
Verify before changing anything else
ReversibleUse the normal profile through sleep and wake without a sign-out.
Evidence ledger
Sources behind this answer
Visible sources support the visible claims. Home Product Support records the publisher, the fact used and the review date; community reports can suggest an issue but do not become a published fact on their own.
Exact questions
Common follow-ups
What should I check before resetting anything?+
Check uptime, crash notifications, free storage and whether the Chromebook is school/work managed.
What is the safest isolation test?+
Test Guest mode and another network; update ChromeOS and remove only the extension proven to crash the session.
When should I stop troubleshooting?+
Do not Powerwash a managed device or a Chromebook with unbacked-up local files.
Answer for the exact device and software version shown above.