I also have a Barney who has just found his voice (he is 8 months).
I was told it's because he has taken on the roll as pack leader so every little thing he barks at is to warn us as he feels he needs to protect the rest of the pack, very sweet but also lots of headaches.

Not sure of a solution yet still looking for advice, been told not to stroke him and tell him it's ok as this is just praising the barking.

Not much help to you sorry but can understand your frustation.