Q: Mac mini keeps crashing

Can someone help diagnose why my mac mini keeps crashing?

I bought it second hand, and it had been upgraded to the latest OS El Capitan (originally it would have had OSX server).  The machine looks in very good condition (physically).

It has crashed probably about 10 times in the 3 weeks I have owned it, and using it today to watch Hulu, it has crashed repeatedly.  Generally, it is kept on for days at a time - not sure if this is related, although of course it is now crashing a lot today.  It also seems to be the case that it crashes while video is playing, either streaming or in VLC.  Usually the mac freezes completely: the video becomes still, no sound, and nothing whatsoever works (not even the ouse will move).  I have to hard-restart with the power button.  Alternatively, the machine sometimes just restarts and begins to boot up without a freeze-frame effect.

On this last occasion (leading me to post this), I had switched to playing a video with VLC on mute, while iTunes was playing.  I have several external drives connected including a USB Hub, and also a bluetooth keyboard and a bluetooth sound system. The display is my TV via HDMI.

The panic report is below - I don't know how to interpret it.  Can anyone please help?

Anonymous UUID:       0C0BC4B6-3A7A-605F-7632-954C86529610

Anonymous UUID:       0C0BC4B6-3A7A-605F-7632-954C86529610

Sun Aug 21 18:18:59 2016

*** Panic Report ***

panic(cpu 0 caller 0xffffff801c7ce6fa): Kernel trap at 0xffffff801c6ca3e3, type 14=page fault, registers:

CR0: 0x0000000080010033, CR2: 0xffffff80edead248, CR3: 0x0000000185d16000, CR4: 0x0000000000002660

RAX: 0xffffff80edead000, RBX: 0xffffff803087de40, RCX: 0x0000000000000048, RDX: 0xffffff9127ce3e40

RSP: 0xffffff9127ce3de0, RBP: 0xffffff9127ce3e00, RSI: 0x000000004f1ddc2a, RDI: 0xffffff803087de40

R8:  0x0000000057b9d41c, R9:  0xffffffff00000000, R10: 0x00000000000003e8, R11: 0x0000000000000206

R12: 0xffffff803087de40, R13: 0x0000000000000013, R14: 0xffffff9127ce3e40, R15: 0x0000000000001807

RFL: 0x0000000000010287, RIP: 0xffffff801c6ca3e3, CS:  0x0000000000000008, SS:  0x0000000000000010

Fault CR2: 0xffffff80edead248, Error code: 0x0000000000000009, Fault CPU: 0x0, PL: 1

Backtrace (CPU 0), Frame : Return Address

0xffffff9127ce3a70 : 0xffffff801c6dab52

0xffffff9127ce3af0 : 0xffffff801c7ce6fa

0xffffff9127ce3cd0 : 0xffffff801c7ec563

0xffffff9127ce3cf0 : 0xffffff801c6ca3e3

0xffffff9127ce3e00 : 0xffffff801c6c7c3c

0xffffff9127ce3ea0 : 0xffffff801c6e2936

0xffffff9127ce3ee0 : 0xffffff801c6d1bf4

0xffffff9127ce3f10 : 0xffffff801c7b8eca

0xffffff9127ce3fb0 : 0xffffff801c7ecd86

BSD process name corresponding to current thread: iTunes

Mac OS version:

15G31

Kernel version:

Darwin Kernel Version 15.6.0: Thu Jun 23 18:25:34 PDT 2016; root:xnu-3248.60.10~1/RELEASE_X86_64

Kernel UUID: B5AA8E3E-65B6-3D0E-867B-8DCCF81E536C

Kernel slide:     0x000000001c400000

Kernel text base: 0xffffff801c600000

__HIB  text base: 0xffffff801c500000

System model name: Macmini4,1 (Mac-F2208EC8)

System uptime in nanoseconds: 1840863639631

last loaded kext at 1051179609969: com.Logitech.Control Center.HID Driver 3.9.3 (addr 0xffffff7f9f85b000, size 278528)

last unloaded kext at 1116424951616: com.Logitech.Control Center.HID Driver 3.9.3 (addr 0xffffff7f9f85b000, size 278528)

loaded kexts:

com.apple.filesystems.msdosfs 1.10

com.apple.driver.AudioAUUC 1.70

com.apple.driver.AppleHWSensor 1.9.5d0

com.apple.driver.AGPM 110.22.0

com.apple.driver.ApplePlatformEnabler 2.6.0d0

com.apple.filesystems.autofs 3.0

com.apple.driver.AppleOSXWatchdog 1

com.apple.driver.AppleMikeyHIDDriver 124

com.apple.driver.AppleHDA 274.12

com.apple.driver.ACPI_SMC_PlatformPlugin 1.0.0

com.apple.driver.AppleMikeyDriver 274.12

com.apple.GeForceTesla 10.0.0

com.apple.driver.AppleUpstreamUserClient 3.6.1

com.apple.driver.AppleMCCSControl 1.2.13

com.apple.driver.pmtelemetry 1

com.apple.iokit.IOUserEthernet 1.0.1

com.apple.iokit.IOBluetoothSerialManager 4.4.6f1

com.apple.Dont_Steal_Mac_OS_X 7.0.0

com.apple.driver.AppleHV 1

com.apple.driver.AppleIntelSlowAdaptiveClocking 4.0.0

com.apple.driver.AppleLPC 3.1

com.apple.iokit.BroadcomBluetoothHostControllerUSBTransport 4.4.6f1

com.apple.AppleFSCompression.AppleFSCompressionTypeDataless 1.0.0d1

com.apple.AppleFSCompression.AppleFSCompressionTypeZlib 1.0.0

com.apple.BootCache 38

com.apple.driver.AppleIRController 327.6

com.apple.iokit.SCSITaskUserClient 3.7.7

com.apple.driver.AppleUSBStorageCoexistentDriver 3.7.1

com.apple.iokit.IOAHCIBlockStorage 2.8.5

com.apple.driver.AirPort.Brcm4331 800.20.24

com.apple.driver.AppleFWOHCI 5.5.4

com.apple.driver.AppleAHCIPort 3.1.8

com.apple.iokit.AppleBCM5701Ethernet 10.2.0

com.apple.driver.AppleSDXC 1.7.0

com.apple.driver.usb.AppleUSBOHCIPCI 1.0.1

com.apple.driver.usb.AppleUSBEHCIPCI 1.0.1

com.apple.driver.AppleRTC 2.0

com.apple.driver.AppleHPET 1.8

com.apple.driver.AppleACPIButtons 4.0

com.apple.driver.AppleSMBIOS 2.1

com.apple.driver.AppleACPIEC 4.0

com.apple.driver.AppleAPIC 1.7

com.apple.driver.AppleIntelCPUPowerManagementClient 218.0.0

com.apple.nke.applicationfirewall 163

com.apple.security.quarantine 3

com.apple.security.TMSafetyNet 8

com.apple.driver.AppleIntelCPUPowerManagement 218.0.0

com.apple.driver.AppleBluetoothHIDKeyboard 181

com.apple.driver.AppleHIDKeyboard 181

com.apple.AppleGraphicsDeviceControl 3.12.8

com.apple.kext.triggers 1.0

com.apple.driver.DspFuncLib 274.12

com.apple.kext.OSvKernDSPLib 525

com.apple.driver.IOPlatformPluginLegacy 1.0.0

com.apple.driver.AppleHDAController 274.12

com.apple.iokit.IOHDAFamily 274.12

com.apple.iokit.IOAudioFamily 204.4

com.apple.vecLib.kext 1.2.0

com.apple.nvidia.classic.NVDANV50HalTesla 10.0.0

com.apple.nvidia.classic.NVDAResmanTesla 10.0.0

com.apple.iokit.IOSurface 108.2.3

com.apple.iokit.IOSerialFamily 11

com.apple.driver.CoreCaptureResponder 1

com.apple.iokit.IOSlowAdaptiveClockingFamily 1.0.0

com.apple.driver.IOPlatformPluginFamily 6.0.0d7

com.apple.iokit.IOBluetoothHostControllerUSBTransport 4.4.6f1

com.apple.iokit.IOFireWireIP 2.2.6

com.apple.driver.AppleSMC 3.1.9

com.apple.driver.AppleSMBusController 1.0.14d1

com.apple.driver.AppleSMBusPCI 1.0.14d1

com.apple.iokit.IONDRVSupport 2.4.1

com.apple.iokit.IOGraphicsFamily 2.4.1

com.apple.driver.usb.IOUSBHostHIDDevice 1.0.1

com.apple.driver.IOBluetoothHIDDriver 4.4.6f1

com.apple.iokit.IOBluetoothFamily 4.4.6f1

com.apple.iokit.IOUSBHIDDriver 900.4.1

com.apple.driver.usb.AppleUSBHub 1.0.1

com.apple.iokit.IOSCSIBlockCommandsDevice 3.7.7

com.apple.iokit.IOUSBMassStorageClass 4.0.2

com.apple.iokit.IOUSBMassStorageDriver 1.0.0

com.apple.iokit.IOSCSIArchitectureModelFamily 3.7.7

com.apple.driver.usb.cdc 5.0.0

com.apple.driver.usb.networking 5.0.0

com.apple.driver.usb.AppleUSBHostCompositeDevice 1.0.1

com.apple.iokit.IO80211Family 1110.26

com.apple.driver.corecapture 1.0.4

com.apple.iokit.IOFireWireFamily 4.6.1

com.apple.iokit.IOAHCIFamily 2.8.1

com.apple.iokit.IOEthernetAVBController 1.0.3b3

com.apple.driver.mDNSOffloadUserClient 1.0.1b8

com.apple.iokit.IONetworkingFamily 3.2

com.apple.driver.usb.AppleUSBOHCI 1.0.1

com.apple.driver.usb.AppleUSBEHCI 1.0.1

com.apple.driver.AppleEFINVRAM 2.0

com.apple.driver.NVSMU 2.2.9

com.apple.iokit.IOUSBFamily 900.4.1

com.apple.driver.AppleEFIRuntime 2.0

com.apple.iokit.IOUSBHostFamily 1.0.1

com.apple.driver.AppleUSBHostMergeProperties 1.0.1

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 417.4

com.apple.iokit.IOStorageFamily 2.1

com.apple.iokit.IOReportFamily 31

com.apple.driver.AppleFDEKeyStore 28.30

com.apple.driver.AppleACPIPlatform 4.0

com.apple.iokit.IOPCIFamily 2.9

com.apple.iokit.IOACPIFamily 1.4

com.apple.kec.Libm 1

com.apple.kec.pthread 1

com.apple.kec.corecrypto 1.0

Model: Macmini4,1, BootROM MM41.0042.B03, 2 processors, Intel Core 2 Duo, 2,66 GHz, 8 GB, SMC 1.65f2

Graphics: NVIDIA GeForce 320M, NVIDIA GeForce 320M, PCI, 256 MB

Memory Module: BANK 0/DIMM0, 4 GB, DDR3, 1067 MHz, 0x8502, 0x505341333447313036363253000000000000

Memory Module: BANK 1/DIMM0, 4 GB, DDR3, 1067 MHz, 0x0000, -

AirPort: spairport_wireless_card_type_airport_extreme (0x14E4, 0x93), Broadcom BCM43xx 1.0 (5.106.98.100.24)

Bluetooth: Version 4.4.6f1 17910, 3 services, 27 devices, 1 incoming serial ports

Network Service: Wi-Fi, AirPort, en1

Serial ATA Device: ST9500423AS, 500,11 GB

USB Device: USB Bus

USB Device: USB Bus

USB Device: BRCM2070 Hub

USB Device: Bluetooth USB Host Controller

USB Device: IR Receiver

USB Device: USB 2.0 Bus

USB Device: My Book

USB Device: My Book 1140

USB Device: USB 2.0 Bus

USB Device: USB 2.0 Hub

USB Device: Ext HDD 1021

USB Device: Microsoft Nano Transceiver 1.1

USB Device: Elements 10B8

Thunderbolt Bus: