Iphone 5 volume Down button dont Work only when you up the sound

I am having the same problem. Arrived today. Does not work! Ocassionally it does work but volume goes all the way to zero like it is stuck down. Tryed power/home reboot among other things but no luck. Should we have bought a samsung instead? ;)

I have the same issue and took my iPhone 5 to Genius Bar but I could not replicate at Apple Store. Recommendation was to Restore if problem recurred. The problem recurred, I have Restored, but the problem persists.

Upon further troubleshooting, Reset All Setting appears to work. Goto Settings --> General --> Reset --> Reset All Settings