UGREEN USB-C Car Charger 69W (Black)

Q1: Why does it sometimes wake up my device when I plug in or unplug another device ?

When multiple devices are connected at the same time, plugging a new device in or unplugging any of the devices from the charger will render a short charging pause for other devices. This short pause is due to the power redistribution of the charger.

Q2: Why is there a situation of disconnection when I charge my Apple watches with port A?

Generally, we suggest you use the USB C port to charge Apple watch. If you want to to use the USB A port, only the C1 and A port can be used simultaneously under the circumstances.