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...
(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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