Xperia Z - Bluetooth speaker connection misbehaving

[Jugs]

Dear Sony,

Request your help on the following issue.

After the Lollipop update, on my C6602, I am unable to control the volume on my JBL Charge speaker connected via Bluetooth, using the volume rocker switches. I did write to the Xperia support/care. As per their solution I hard reset (repaired the software while pressing down the volume key) my phone, but in vain. Also many times the connection to the speaker is lost without any interruption. In short the connection is hampered.

Regards,
Jugal

[srids]

I use MW600. it was working well with 4.4.4 xperia Z

once after update of 5.0, it doesn't show callers name. some time sound won't come and after pressing multiple play pause buttion, music restarts.

good improvements are connects faster than 4.4.4.