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What are the known issues with firmware Rev v4.0?

In the past, I paired with one guy and it was fine.  But I want to be able to pair with at least 4 in an open channel, so I was pleased to hear about v4.0 allowing this.  I just upgraded a couple days ago. I paired with my new Garmin 220 GPS and it worked great. But I would like to know in advance about other issues.  2 friends went in on a pair and I suspect I will have to upgrade the firmware on them. 

Are there any wacky things going on?   I heard of volume loss in 4.0, that would be bad as on the highway, I need all the volume I can get.

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