RF in the shack?
Often a cause of strange intermittent USB disconnects...
What operating system are you using on the PC?
Can you see any evidence that the USB/serial port changed after
it seems to have disconnected?
(Windows Device Manager)? COM1 changed to COM2
Or (Linux)??? Have a terminal session running somewhere visible
(you can shrink the font, so any such session doesnt "hog" the
display) with "dmesg -wH" running, and see what happens at the
bottom of the list.? That will show any "re-enumeration" activity
(or other weirdness) in real time.
It may not be the PC end of the USB cable that has the issue if
the KPC-3+ has USB/Serial built in.? They would not be the first
company to "update" an existing product by adding USB, and
introducing a new RF Susceptibility issue.
73
Dave G8KBV.
