Last topic was created on this topic in Sep '17.
There are a lots of “Usb ports” topics but this one is specifically related to the cable.
I received Khadas Tone Board last week. I did everything as instructed and immediately after hour or so it stopped working, lost connection. Reconnecting fixed the issue but only temporarely. Luckily my cellphone uses USB-C cable so i switched Khadas version with the one I use for charging my phone and everything was fine. Didn’t lose connection so far, not even once. 
Basically as I saw in previous posts elsewhere or maybe even here, switching the cable should fix the problem.