Hi Roger. Sent you an email to your k9ljb email address. I have the same problem. Mine started new out of the box, even sent it back and they sent me another new unit. New unit had the same problem, same attempts at fixing. Details in the email.
The folks at LNR were very helpful and receptive, but so far no explanation. Tried the same things; battery out, filters, key changes, cables, on and on. Works great with keyer, but since I am a straight key guy, the keyer is just dead weight for me.
Hope they figure it out. I suspect a lot more guys might have the same problem, but don’t know it because they might not be on the straight key as much.