Hi @will-huang-oksi
Are you willing to share some pics? Might be a cabling issue (GND loop or lack of a common GND), or some other intermittent connection causing your problems.
It really is hard to debug without seeing the setup.
I don't see any Qualcomm device with running "lsusb".
I also have confirmed that the USB-C cable is able to access another VOXL device.
So I have submitted the RMA
d45c5737-8bf3-4c8b-9e7d-851acbfe82a8-image.png
Please let me know if any questions or suggestions.
Thank you very much for supporting.