Currently Being ModeratedMay 5, 2013 5:40 PM (in response to BRAIN2001)
If you are referring to the volume minus button on the left side, you can still reduce volume by Settings > Sounds and move the volume slider down. But you will want to have that checked by the techs at an Apple store genius bar, especially while still under warranty.
Currently Being ModeratedMay 8, 2013 8:22 AM (in response to Ralph Landry1)
Yes true (to go through the settings) but you can not control the volume if you are watching a video or playing a game! Any ideas on how to fix it? Is it a software bug?
Currently Being ModeratedSep 24, 2013 10:50 AM (in response to BRAIN2001)
Take it to the Genius Bar while you are still under warranty and they should be able to fix it. I went, one day after my warranty expired. While they confirmed the problem in my iPhone 5, they said it would be $269 to fix. The tech did helpfully show me how there's a much less convenient softkey workaround using General >Accessibility > AssistiveTouch. Seems to be a common problem.