My iMac wont boot up properly. Stops at background pic, no dock, only little apple show up top and cursor sticks on little spinning wheel. Have to shut down manually in back and reboot to get it to work. Any ideas why this sometimes happens?

I'm running OSX 10.9.1 (13B42)
My problem is that occasionally my Mac wont boot properly. It gets to the background picture where the dock should open but it freezes there. The little apple shows up top left but nothing else and the cursor shows as the little spinning wheel that wont do anything. I can't click on the apple to restart, I have to switch off in back and then start up again. It usally boots all the way after that but I'm worried there's something up since this seems to be happeneing more frequently. Also I'm worried that having to manually shut down like that will somehow damage the software in time?
I tried a disk verify but there were no repairs needed. I repaired disk permissions too just in case but it still seems to happen every once in a while.
I've noticed recently that it happens the next reboot after I've been streaming movies online if that helps. Is there any reason for this and anything i can do to stop it in the future?

Thanks Paul, just ran the etrecheck you recommended and got this:
Hardware Information:
          iMac (21.5-inch, Mid 2011)
          iMac - model: iMac12,1
          1 2.5 GHz Intel Core i5 CPU: 4 cores
          4 GB RAM
Video Information:
          AMD Radeon HD 6750M - VRAM: 512 MB
System Software:
          OS X 10.9.1 (13B42) - Uptime: 0 days 0:45:16
Disk Information:
          ST3500418AS disk0 : (500.11 GB)
                    EFI (disk0s1) <not mounted>: 209.7 MB
                    Macintosh HD (disk0s2) /: 499.25 GB (350.35 GB free)
                    Recovery HD (disk0s3) <not mounted>: 650 MB
          OPTIARC DVD RW AD-5690H 
USB Information:
          Apple Inc. FaceTime HD Camera (Built-in)
          Samsung SCX-4600 Series
          Apple Inc. BRCM2046 Hub
                    Apple Inc. Bluetooth USB Host Controller
          Apple Internal Memory Card Reader
          Apple Computer, Inc. IR Receiver
FireWire Information:
Thunderbolt Information:
          Apple Inc. thunderbolt_bus
Kernel Extensions:
          com.sophos.kext.sav          (8.0.14)
Startup Items:
          MobileBrServ: Path: /Library/StartupItems/MobileBrServ
Problem System Launch Daemons:
Problem System Launch Agents:
Launch Daemons:
          [loaded] com.adobe.fpsaud.plist 3rd-Party support link
          [loaded] com.adobe.SwitchBoard.plist 3rd-Party support link
          [loaded] com.anchorfree.ajaxserver.plist 3rd-Party support link
          [loaded] com.microsoft.office.licensing.helper.plist 3rd-Party support link
          [loaded] com.sophos.autoupdate.plist 3rd-Party support link
          [loaded] com.sophos.intercheck.plist 3rd-Party support link
          [loaded] com.sophos.notification.plist 3rd-Party support link
Launch Agents:
          [not loaded] com.adobe.AAM.Updater-1.0.plist 3rd-Party support link
          [loaded] com.adobe.CS5ServiceManager.plist 3rd-Party support link
          [loaded] com.sophos.uiserver.plist 3rd-Party support link
User Launch Agents:
          [loaded] com.adobe.AAM.Updater-1.0.plist 3rd-Party support link
          [failed] com.apple.CSConfigDotMacCert-[...]@me.com-SharedServices.Agent.plist 3rd-Party support link
          [loaded] com.divx.agent.postinstall.plist 3rd-Party support link
          [loaded] com.google.keystone.agent.plist 3rd-Party support link
User Login Items:
          iTunesHelper
          BitTorrent
Internet Plug-ins:
          Flip4Mac WMV Plugin: Version: 2.4.4.2 3rd-Party support link
          FlashPlayer-10.6: Version: 12.0.0.38 - SDK 10.6 3rd-Party support link
          OVSHelper: Version: 1.1 3rd-Party support link
          Flash Player: Version: 12.0.0.38 - SDK 10.6 3rd-Party support link
          Default Browser: Version: 537 - SDK 10.9
          DivXBrowserPlugin: Version: 2.2 3rd-Party support link
          QuickTime Plugin: Version: 7.7.3
          SharePointBrowserPlugin: Version: 14.0.0 3rd-Party support link
          JavaAppletPlugin: Version: 14.9.0 - SDK 10.7 Outdated! Update
Audio Plug-ins:
          BluetoothAudioPlugIn: Version: 1.0 - SDK 10.9
          AirPlay: Version: 1.9 - SDK 10.9
          AppleAVBAudio: Version: 2.0.0 - SDK 10.9
          iSightAudio: Version: 7.7.3 - SDK 10.9
3rd Party Preference Panes:
          DivX  3rd-Party support link
          Flash Player  3rd-Party support link
          Flip4Mac WMV  3rd-Party support link
          Growl  3rd-Party support link
Bad Fonts:
          None
Old Applications:
          /Library/Sophos Anti-Virus
                    SophosAntiVirus:          Version: 8.0.8.1 - SDK 10.5 3rd-Party support link
                    SophosAutoUpdate:          Version: 8.0.15 - SDK 10.5 3rd-Party support link
                    SophosUIServer:          Version: 8.0.21 - SDK 10.5 3rd-Party support link
                    InterCheck:          Version: 8.0.8.1 - SDK 10.5 3rd-Party support link
          VLC:          Version: 2.0.1 - SDK 10.5 3rd-Party support link
          Sophos Anti-Virus:          Version: 8.0.21 - SDK 10.5 3rd-Party support link
          Spotify:          Version: 0.8.4.93.gd9f49c35 - SDK 10.5 3rd-Party support link
          Install Spotify:          Version: 1.0 - SDK 10.5 3rd-Party support link
                    /Users/[redacted]/Downloads/Programs/Install Spotify.app
Time Machine:
          Time Machine not configured!
Top Processes by CPU:
               2%          WindowServer
               2%          EtreCheck
               0%          Google Chrome
               0%          hidd
               0%          SophosUIServer
Top Processes by Memory:
          438 MB          firefox
          139 MB          InterCheck
          119 MB          com.apple.IconServicesAgent
          106 MB          Google Chrome
          78 MB          mds_stores
Virtual Memory Information:
          370 MB          Free RAM
          1.59 GB          Active RAM
          1.25 GB          Inactive RAM
          813 MB          Wired RAM
          397 MB          Page-ins
          0 B          Page-outs
I have no idea what all the means, lol.

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