Hi,
Based on who purchased the device, the client is not a client facing company so there really isn't much I can help you there.
The issue is indeed strange, have you any option of trying to power the device not from the original PSU, maybe that's what failed? and when there is a bit higher load, the PSU just start failing.
you can power it via anything that's 9-50V DC for testing purposes.
We do not repair the devices unless it's warranty repair. The device is still ir warranty for another month, if you figure out how to get in touch with the guys who sold you the device, they might fill out a warranty request