I have almost cured this using a high quality powered 7 way usb hub. Very
chunky psu and hub is made from very solid alluminium.
Now the remainder of the issue seems to be earthing and position of cables
related.
Thus most of this crud was coming up the supply line obviously, the
culpriit seems also to be the SSD made by Samsung in the computer.
Brian

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This newsgroup posting comes to you directly from...
The Sofa of Brian Gaff...

Blind user, so no pictures please!