Why did my AP reboot unexpectedly with the “Reboot by cold start” log
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Zyxel_HsinBo
Posts: 525 
Zyxel Employee
Zyxel Employee
in Other Topics
A “Reboot by cold start” message indicates that the AP was rebooted due to a power interruption, meaning the device lost power abruptly rather than performing a normal software-initiated reboot.
This is typically caused by issues such as:
- An unstable or insufficient power supply device
- A faulty or aging power adapter
- Poor-quality or damaged power cables
- Insufficient or unstable PoE power from the switch or injector
When the power source fluctuates or drops momentarily, the AP will reboot and record a cold-start event.
We recommend checking the power adapter, PoE source, cabling, and overall power budget to identify and resolve the cause.
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