I would think that is the correct way for the Garmin Zumo 595lm to act.
It takes priority over any info coming in.
If both Zumo and voice conversation was going on at the same time at the same volume it would be garbled.
Zumo takes control and giving you a message about an exit here or a speed cam there.
If you try to have both at the same time nothing would be clear.
Then the person or persons will have to repeat what they said after the Zumo is finished with it's message or messages.When nav gives commands intercom volume gets very low and i can't hear what other people are saying.
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