Hardware or Software Issues?

I've been having some odd problems with my iPhone 4S these past few weeks and am wondering if these are hardware or sofware problems.
I'll notice that randomly when listening to music, the volume will decrease on it's own own to almost nothing. I'll turn it back up, and a few minutes later, the same thing happens again.
I'll also find that sometimes the screen isn't very responsive. I'll need to touch icons a few times before they launch or folders close.
Also, this morning while browsing through Instagram, the home/lock buttons just stopped working. I was still able to navigage within the app no problem, but I just couldn't exit it or lock it. I did finally get it to reboot by holding down both buttons for about 10 seconds.
I've had every single iPhone since the first one and never experienced these issues. Also, I'm inclined to think it's more hardware than software because these issues just started popping up a few weeks ago and haven't been here from day one. I've done a restore and the issues still persist.

Hi Ralph,
Yes, I've done all this.
I took it to an Apple store last week (just as a walk-in) and was basically told to do the restore and come back if it's still acting up and see a Genius. I went through the whole restore process and while using it this past week I'd see the problems come and go.
I'm going in later today to a Genius appointment, but I'm afraid that because the problems pop up randomly it'll be hard to recreate it for them. I'd really like for them to just swap it out with a replacement. Is this likely to happen?

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    com.apple.driver.AppleIntelCPUPowerManagementClient          218.0.0
    com.apple.nke.applicationfirewall   161
    com.apple.security.quarantine        3
    com.apple.security.TMSafetyNet     8
    com.apple.driver.AppleIntelCPUPowerManagement        218.0.0
    com.apple.iokit.IOSerialFamily         11
    com.apple.AppleGraphicsDeviceControl     3.7.21
    com.apple.kext.triggers         1.0
    com.apple.driver.DspFuncLib          267.0
    com.apple.kext.OSvKernDSPLib      1.15
    com.apple.iokit.IOAudioFamily         200.6
    com.apple.vecLib.kext           1.2.0
    com.apple.iokit.IOSurface     97
    com.apple.nvidia.classic.NVDANV50HalTesla         10.0.0
    com.apple.nvidia.classic.NVDAResmanTesla           10.0.0
    com.apple.iokit.IOFireWireIP           2.2.6
    com.apple.driver.IOPlatformPluginLegacy 1.0.0
    com.apple.iokit.IOBluetoothHostControllerUSBTransport            4.3.1f2
    com.apple.iokit.IOBluetoothFamily  4.3.1f2
    com.apple.iokit.IOUSBUserClient     705.4.0
    com.apple.driver.AppleHDAController        267.0
    com.apple.iokit.IOHDAFamily           267.0
    com.apple.driver.AppleSMBusPCI   1.0.12d1
    com.apple.driver.IOPlatformPluginFamily 5.8.0d49
    com.apple.driver.AppleBacklightExpert     1.1.0
    com.apple.driver.AppleSMBusController    1.0.13d1
    com.apple.iokit.IONDRVSupport      2.4.1
    com.apple.iokit.IOGraphicsFamily    2.4.1
    com.apple.driver.AppleSMC 3.1.9
    com.apple.driver.AppleUSBMultitouch       245.2
    com.apple.iokit.IOUSBHIDDriver     705.4.0
    com.apple.iokit.IOSCSIBlockCommandsDevice       3.7.0
    com.apple.iokit.IOUSBMassStorageClass     3.7.0
    com.apple.iokit.IOSCSIMultimediaCommandsDevice        3.7.0
    com.apple.iokit.IOBDStorageFamily 1.7
    com.apple.iokit.IODVDStorageFamily          1.7.1
    com.apple.iokit.IOCDStorageFamily 1.7.1
    com.apple.driver.AppleUSBMergeNub       705.4.0
    com.apple.driver.AppleUSBComposite        705.4.9
    com.apple.iokit.IOAHCISerialATAPI 2.6.1
    com.apple.iokit.IOSCSIArchitectureModelFamily   3.7.0
    com.apple.iokit.IO80211Family       700.52
    com.apple.iokit.IOAHCIFamily          2.7.0
    com.apple.iokit.IONetworkingFamily           3.2
    com.apple.iokit.IOFireWireFamily    4.5.6
    com.apple.iokit.IOUSBFamily            705.4.14
    com.apple.driver.NVSMU      2.2.9
    com.apple.driver.AppleEFINVRAM  2.0
    com.apple.driver.AppleEFIRuntime            2.0
    com.apple.iokit.IOHIDFamily            2.0.0
    com.apple.iokit.IOSMBusFamily       1.1
    com.apple.security.sandbox 300.0
    com.apple.kext.AppleMatch 1.0.0d1
    com.apple.driver.AppleKeyStore     2
    com.apple.driver.AppleMobileFileIntegrity            1.0.5
    com.apple.driver.AppleCredentialManager           1.0
    com.apple.driver.DiskImages           389.1
    com.apple.iokit.IOStorageFamily      2.0
    com.apple.iokit.IOReportFamily       31
    com.apple.driver.AppleFDEKeyStore          28.30
    com.apple.driver.AppleACPIPlatform         3.1
    com.apple.iokit.IOPCIFamily 2.9
    com.apple.iokit.IOACPIFamily          1.4
    com.apple.kec.corecrypto     1.0
    com.apple.kec.pthread          1
    com.apple.kec.Libm   1
    Model: MacBookPro5,4, BootROM MBP53.00AC.B03, 2 processors, Intel Core 2 Duo, 2.53 GHz, 8 GB, SMC 1.49f2
    Graphics: NVIDIA GeForce 9400M, NVIDIA GeForce 9400M, PCI, 256 MB
    Memory Module: BANK 0/DIMM0, 4 GB, DDR3, 1067 MHz, 0x0198, 0x393930353432382D3034322E4130304C4620
    Memory Module: BANK 1/DIMM0, 4 GB, DDR3, 1067 MHz, 0x0198, 0x393930353432382D3034322E4130304C4620
    AirPort: spairport_wireless_card_type_airport_extreme (0x14E4, 0x8D), Broadcom BCM43xx 1.0 (5.106.98.100.24)
    Bluetooth: Version 4.3.1f2 15015, 3 services, 19 devices, 1 incoming serial ports
    Network Service: Wi-Fi, AirPort, en1
    Serial ATA Device: Hitachi HTS545025B9SA02, 250.06 GB
    Serial ATA Device: MATSHITADVD-R   UJ-868
    USB Device: Built-in iSight
    USB Device: Internal Memory Card Reader
    USB Device: Apple Internal Keyboard / Trackpad
    USB Device: IR Receiver
    USB Device: BRCM2046 Hub
    USB Device: Bluetooth USB Host Controller
    Thunderbolt Bus:

    Hey KoreanSasquatch, 
    Thanks for contributing to the Apple Support Communities. 
    If your MacBook Pro is turning off unexpectedly, isolating the issue to hardware or software is a good place to start. 
    You may find the tips in this article helpful with isolating this behavior:
    OS X: When your computer spontaneously restarts or displays "Your computer restarted because of a problem." - Apple Support
    All the best,
    Jeremy 

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