I have a 4th generation (?) iPod Touch, 32 GB, not the newest iPod touch, but the second newest. It is completely up to date, and it has worked perfectly ever since my mother gave it to me when she upgraded to an iPhone 5. This morning, I plugged it into my MacBook (late 2009-model white unibody), which is also entirely up to date with newest OS and all software updates. It synced, and I waited until it told me it was finished, clicked eject, and unplugged it. I got into my car to go to work, plugged the auxiliary cable in like I always do, and hit play. It played two songs just fine, but a minute into a third song, it stopped producing sound. I looked down at my iPod, and there was no slider for the volume. I tried using the volume buttons, and they didn't do anything, either. I unplugged the auxiliary cable, but still no sound, volume slider, or volume button usage. I rebooted the iPod: still nothing. I got to work and plugged my iPod into my iHome, which uses a docking system rather than an auxiliary cable, and it works perfectly. I pulled the iPod off the dock, and it's once again giving me sound. However, I'm afraid this will happen again. My iPod didn't start acting up like this until after I plugged it in to my Mac to sync it. Anyone else have this problem or know a solution? Quite frankly, I am stumped.