It could be a power issue... the adapter may have large decoupling capacitors, and plugging in will drain a lot of power to charge those capacitors, and it can lead to a brownout or a reset.
If you have an oscilloscope you can probe the power rails and check if there's a large voltage drop when you plug the adapter.

But it would not explain why it reboots while unplugging...

Mauro
https://www.maurosouza.com - registered Linux User: 294521
Scripture is both history, and a love letter from God.


On Mon, Dec 22, 2025 at 4:25 PM William Park via Talk <talk@lists.gtalug.org> wrote:
(Double posted, so reply to your list)

To anyone with Raspberry Pi Zero 2W...

I just got Zero 2W + mini HDMI adapter + micro USB OTG cable combo, from Amazon last week. All seem to be working. Except, whenever I plug or unplug OTG cable, the Zero 2W reboots. Nothing is connected to the USB cable, so it's not "power" issue. I don't know if the problem is Zero 2W side or USB cable side.

Does your Zero 2W reboot, when you plug/unplug OTG cable?
It's strange that plugging/unplugging just USB cable, would cause a reboot.
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