I'll try to make it short and sweet for you :

When someone calls me or when i call someone and when the conversation is started it takes between 4 and 6sec before the other person starts hearing what i'm saying (hello, hello, hello...).

It happens at 70% of cases and sometimes it just works normally as other devices do ! (N8, N900 etc.)

I don't know what causes this, and if i'll exchange my N9 for a new one...bug? Feature? It works randomly so i've no idea...

am i the only one with this bug?

Ps : After PR1.1 i was happy that the bug was gone, but after 2 days, it starts to "appear" again !

a simple test i do every time i've this bug is to call (or ask to be called) immediately on my N8, and of course, it just works as it should, no bugs, no blank sec before someone starts/can hear you