How can I tell if my 910 D2 driver is broken?

I have experienced something strange with my beloved 910 D2 driver. When I hit balls in the driving range today, I noticed a bit difference in the sound, but I found my 910 D2 seems to have lost pop and I have lost around 40 ~ 50 or more yards of distance. I know this driving range and I know how long I used to hit. Finally I came to the hypothesis that m 910 D2 driver is cracked or broken.

The problem is that there are no visual cracks. Maybe it is just me but it seems off.

How can I tell if my 910 D2 driver is broken? Is there place I can send it back to re-exam mine by the expert? How much does it cost to do so?

This is my first time so any useful information would be appreciated. Thank you!

Hi,  Please contact your local pro shop and have them set up a warranty inspection and they can test your driver head to see if there is a problem with it.