This sounds vaguely familiar Ken, seem to recall some chatter on Teamspeak
from someone that seemed to be seeing what you're describing.
I wonder if the new optimized hardware control might be a little too
optimized somewhere? To sort that out you could try a level of code
before the new hw control code was added According to the release notes
1.3.2 is the last release with the older hardware control code intact. If
you don't see the problem on 1.3.2 then it's more likely a software glitch
than RFI. Note that the CAT stuff in 1.3.2 is a bit glitchy.
Bill (kd5tfd)