Airport Extreme reboots when accessing attached USB disk

An external USB hard disk drive is attached to the AirPort Extreme.

Does this have its own power supply, or does it rely on the APExtreme

USB Ports power the hard drive so attached? Or does it have a power

adapter of its own? Too much load on the USB port may be a problem.

There is a possibility the externally enclosed hard disk drive may be

failing, if it has its own power supply seems OK; also there is another

possibility that the enclosure itself could have become defective.

Have you made a backup of that HDDs content and then tried a different

externally enclosed HDD to see if that causes problems when attached

to the AirPort Extreme? Sometimes a powered USB hub can help if the

matter is too much load on the USB port. A failing HDD enclosure could

also be using excess power, and that may cause the AX to reset.

Even so, there may be some other issue behind this. Does the AX work

correctly without flaw, when the USB drive is removed from the situation?

Time for trial & error troubleshooting... 😐

Sometimes when the circuitry inside the enclosure may fail and affect how

the hard drive within the case functions, this may also affect communication

between the external drive and other attached items that share those ports.

I'd suspect cables, the external HDD, its enclosure, & try troubleshooting methods

that omits or replaces each these one at a time, with different or new hardware.

Peripherals can cause odd effects, and symptoms could mean more than one thing.

Good luck in this matter...😐