In the time I am away, I have ordered another USB-C to USB data lead as Ken's cure (suggested in a comment yesterday) did not work.
To rule out the possibility of a lead problem, I shall replace the lead. This will have to wait until next week before I can try this.
Hi Roger, another simple thing to try, I was plagued by this for ages, try running a separate earth wire from the QMX chassis to your PC. I found a USB lead I had purchased had not connected the screen at both ends, so my USB earth return was via other uncontrolled means.
ReplyDelete73 Ken g4apb