Hi Geoffrey,
Lee and I were discussing this very subject (annoying 'repeating' voice alerts) just the other day (following a prompt from me after a similar experience during a recent test flight), so we
are aware of the issue.
After having given it a bit of thought, Lee now has a much better idea as to what is causing the problem, (it's actually
much more complex than your explanation implies), but no 'solution' yet - so it
is on the 'to do' list, but with so much else is going on at the moment we may have to wait a bit for a proper fix. In the meantime you can minimise the alerts by running PAW on 'Short Range' when flying in a group - Just keep your eyes open for other aircraft (as you should of course be doing anyway).
(Don't worry, I won't let him forget)
Best Regards
Peter