I too have the same issue, but hey what are you doing posting the problem in the forum? This is not any officiL support forum or something, no one even cares whatever problem you have!
Even if you go to sony care, they will hand you a new xperia zr with the same BLUETOOTH problem after few days. I have faced it, better switch to htc or samsung , atleast one of the most common feature BT works on their high end devices.