Probably the issue is not about shielding, but common ground of USB and Analog circuit. I will look around for micro USB cable with good shielding later. Meanwhile, I have Elfidelity USB ground isolator. It's main function is to isolate USB ground from input to output, and to use external 5V power supply and filter it to provide cleaner 5V DC on the USB output.
I just did some test, using the same USB A extension cable that I used in the previous video, and a super short USB A to micro B as adapter to Mojo. I've tested that this short micro B USB cable is shielded. Here is the test, fresh from my camera, no post processing at all:
What I want to see is if ground isolation is effective to block EMI noise. From the test above, it seems quite effective. I've used the Elfidelity USB Booster (that's the name of the gold color device in the middle) for quite sometime. I've tested that It is compatible to all sampling rate as well as DSD up to DSD256. Not sure if it is compatible with DSD512, I don't have the file to test.
Mojo seems limit the USB handshake to 2 times disconnection. After 2 times, I have to switch it off first to get the USB connection LED ON.
Please take note, I have no intention to discredit Mojo. I really like it, and it is my go to DAC. This EMI on USB will happen to any USB DAC with common ground, not only Mojo.
Anyway, let me know what you think.
I bought the Elfidelity USB Booster here:
https://www.aliexpress.com/item/Music-Hall-Elfidelity-USB-Boosters-USB-audio-interface-Hi-Fi-Power-Filter-for-PC-DAC-AMP/32397141841.html?spm=2114.13010608.0.0.XAaeHL
It was less than $50 when I bought it in 2015.