RMBP - external screen turns black for a few seconds every once in a while

My external screen (Dell U2711) connected via Thunderbolt to Displayport cable turns black every once in a while. The rMBP is in clamshell mode. When it starts it randomly blackens the screen for 2 seconds with an interval of 10 seconds to 5 minutes. A restart usually fixes the issue but it keeps coming back after some time.
Has anybody here experienced something similar?
What can be the cause of that?
This really starts to annoy me, because it seems I have to do reboot everytime I connect my laptop to my screen.

Never had the sort of problem - but then I've an Apple Thunderbolt Display and it just 'works'.
Could be that you're adapter is shot. You could buy a (or some) new ones from Monoprice (much cheaper than what Apple's third-party solutions sell for) and see if that's the problem.
Sorry I can't offer a more helpful solution...
Clinton

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EtreCheck version: 2.2 (132)
Report generated 5/2/15, 9:53 PM
Download EtreCheck from http://etresoft.com/etrecheck
Click the [Click for support] links for help with non-Apple products.
Click the [Click for details] links for more information about that line.
Hardware Information: ℹ️
    MacBook Air (13-inch, Mid 2012) (Technical Specifications)
    MacBook Air - model: MacBookAir5,2
    1 1.8 GHz Intel Core i5 CPU: 2-core
    4 GB RAM Not upgradeable
        BANK 0/DIMM0
            2 GB DDR3 1600 MHz ok
        BANK 1/DIMM0
            2 GB DDR3 1600 MHz ok
    Bluetooth: Good - Handoff/Airdrop2 supported
    Wireless: en0: 802.11 a/b/g/n
    Battery: Health = Normal - Cycle count = 694 - SN = D86218700K2DKRNAF
Video Information: ℹ️
    Intel HD Graphics 4000
        Color LCD 1440 x 900
System Software: ℹ️
    OS X 10.10.3 (14D136) - Time since boot: 0:22:41
Disk Information: ℹ️
    APPLE SSD SM256E disk0 : (251 GB)
        EFI (disk0s1) <not mounted> : 210 MB
        Recovery HD (disk0s3) <not mounted> [Recovery]: 650 MB
        Macintosh HD (disk1) / : 249.77 GB (167.35 GB free)
            Encrypted AES-XTS Unlocked
            Core Storage: disk0s2 250.14 GB Online
USB Information: ℹ️
    Apple, Inc. Keyboard Hub
        Mitsumi Electric Apple Optical USB Mouse
        Apple Inc. Apple Keyboard
    Apple Inc. FaceTime HD Camera (Built-in)
    Apple Inc. BRCM20702 Hub
        Apple Inc. Bluetooth USB Host Controller
    Apple Internal Memory Card Reader
    Apple Inc. Apple Internal Keyboard / Trackpad
Thunderbolt Information: ℹ️
    Apple Inc. thunderbolt_bus
Gatekeeper: ℹ️
    Mac App Store and identified developers
Kernel Extensions: ℹ️
        /Applications/WD +TURBO Installer.app
    [not loaded]    com.wdc.driver.1394HP (1.0.11 - SDK 10.4) [Click for support]
    [not loaded]    com.wdc.driver.1394_64HP (1.0.1 - SDK 10.6) [Click for support]
    [not loaded]    com.wdc.driver.USB-64HP (1.0.3) [Click for support]
    [not loaded]    com.wdc.driver.USBHP (1.0.14) [Click for support]
        /System/Library/Extensions
    [not loaded]    com.wdc.driver.1394.64.10.9 (1.0.1 - SDK 10.9) [Click for support]
    [loaded]    com.wdc.driver.USB.64.10.9 (1.0.1 - SDK 10.9) [Click for support]
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    [failed]    com.apple.mtrecorder.plist
Launch Agents: ℹ️
    [running]    com.mcafee.menulet.plist [Click for support]
    [running]    com.mcafee.reporter.plist [Click for support]
    [loaded]    com.oracle.java.Java-Updater.plist [Click for support]
Launch Daemons: ℹ️
    [running]    com.adobe.ARM.[...].plist [Click for support]
    [loaded]    com.adobe.fpsaud.plist [Click for support]
    [failed]    com.apple.spirecorder.plist
    [running]    com.mcafee.ssm.Eupdate.plist [Click for support]
    [running]    com.mcafee.ssm.ScanManager.plist [Click for support]
    [running]    com.mcafee.virusscan.fmpd.plist [Click for support]
    [loaded]    com.oracle.java.Helper-Tool.plist [Click for support]
User Launch Agents: ℹ️
    [loaded]    com.adobe.ARM.[...].plist [Click for support]
    [loaded]    com.google.keystone.agent.plist [Click for support]
User Login Items: ℹ️
    iTunesHelper    Application Hidden (/Applications/iTunes.app/Contents/MacOS/iTunesHelper.app)
    Dropbox    Application (/Applications/Dropbox.app)
    AdobeResourceSynchronizer    Application Hidden (/Applications/Adobe Reader.app/Contents/Support/AdobeResourceSynchronizer.app)
    EvernoteHelper    Application (/Applications/Evernote.app/Contents/Library/LoginItems/EvernoteHelper.app)
    TouchP-150M    Application (/Applications/Canon P-150M/TouchP-150M.app)
    iPhoto    Application (/Applications/iPhoto.app)
    WDDriveUtilityHelper    Application (/Applications/WD Drive Utilities.app/Contents/WDDriveUtilityHelper.app)
    WDSecurityHelper    Application (/Applications/WD Security.app/Contents/WDSecurityHelper.app)
Internet Plug-ins: ℹ️
    FlashPlayer-10.6: Version: 17.0.0.169 - SDK 10.6 [Click for support]
    QuickTime Plugin: Version: 7.7.3
    AdobePDFViewerNPAPI: Version: 11.0.10 - SDK 10.6 [Click for support]
    AdobePDFViewer: Version: 11.0.10 - SDK 10.6 [Click for support]
    Flash Player: Version: 17.0.0.169 - SDK 10.6 [Click for support]
    Default Browser: Version: 600 - SDK 10.10
    JavaAppletPlugin: Version: Java 8 Update 45 Check version
3rd Party Preference Panes: ℹ️
    Flash Player [Click for support]
    FUSE for OS X (OSXFUSE) [Click for support]
    Java [Click for support]
    MacFUSE [Click for support]
    NTFS-3G [Click for support]
Time Machine: ℹ️
    Skip System Files: NO
    Mobile backups: ON
    Auto backup: YES
    Volumes being backed up:
        Macintosh HD: Disk size: 249.77 GB Disk used: 82.42 GB
    Destinations:
        My Passport Edge for Mac [Local]
        Total size: 499.94 GB
        Total number of backups: 27
        Oldest backup: 2013-01-31 21:15:26 +0000
        Last backup: 2015-05-02 11:33:09 +0000
        Size of backup disk: Adequate
            Backup size 499.94 GB > (Disk used 82.42 GB X 3)
Top Processes by CPU: ℹ️
         6%    WindowServer
         3%    fontd
         2%    VShieldScanManager
         0%    taskgated
         0%    notifyd
Top Processes by Memory: ℹ️
    745 MB    Google Chrome Helper(8)
    439 MB    kernel_task
    246 MB    VShieldScanner(3)
    160 MB    Google Chrome
    127 MB    Finder
Virtual Memory Information: ℹ️
    130 MB    Free RAM
    3.87 GB    Used RAM
    0 B    Swap Used
Diagnostics Information: ℹ️
    May 2, 2015, 09:30:08 PM    Self test - passed
    May 2, 2015, 08:52:59 PM    /Users/[redacted]/Library/Logs/DiagnosticReports/soffice_2015-05-02-205259_[red acted].crash
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    May 1, 2015, 05:35:50 PM    /Library/Logs/DiagnosticReports/mds_2015-05-01-173550_[redacted].crash
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When you have kernel panics, the pertinent information is in the panic report.
These instructions must be carried out as an administrator. If you have only one user account, you are the administrator.
Launch the Console application in any of the following ways:
☞ Enter the first few letters of its name into a Spotlight search. Select it in the results (it should be at the top.)
☞ In the Finder, select Go ▹ Utilities from the menu bar, or press the key combination shift-command-U. The application is in the folder that opens.
☞ Open LaunchPad and start typing the name.
In the Console window, select
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(not Diagnostic and Usage Messages) from the log list on the left. If you don't see that list, select
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from the menu bar.
There is a disclosure triangle to the left of the list item. If the triangle is pointing to the right, click it so that it points down. You'll see a list of reports. A panic report has a name that begins with "Kernel" and ends in ".panic". Select the most recent one. The contents of the report will appear on the right. Use copy and paste to post the entire contents—the text, not a screenshot.
If you don't see any reports listed, but you know there was a panic, you may have chosen Diagnostic and Usage Messages from the log list. Choose DIAGNOSTIC AND USAGE INFORMATION instead.
In the interest of privacy, I suggest that, before posting, you edit out the “Anonymous UUID,” a long string of letters, numbers, and dashes in the header of the report, if it’s present (it may not be.)
Please don’t post other kinds of diagnostic report.
I know the report is long, maybe several hundred lines. Please post all of it anyway.

Macbook Pro 2013 HDMI Monitor Goes Black for a few seconds

So I purchased a brand new Macbook Pro 2013 (specs below) and for the entire time I have been using it with a BenQ RL2455 via HDMI with no problems at all. Recently though I have started to experience problems between the computer and the monitor. There is no particular sequence as to when this will happen but the monitor screen just goes completely black for a couple of seconds, and then goes back to normal.
There is nothing to suggest that the monitor is being disconnected from the mac, as it still detects the fact that the two are still connected. I have followed each cable back to the source and they all seem to be properly connected.
As you can imagine, this is very annoying and inconvenient, and it would be much appreciated if anyone knows any solutions to this. I just thought i'd see if there was anything i could do before i contacted apple, just incase i was being a total idiot and missing something obvious!
Thanks!
Specs:
Macbook Pro Retina 2013
2.6GHz Intel Core i7
16GB Ram
1TB SSD

15" or 13"? How long have to had it?
I've noticed my HDMI monitor comes up blank on reboot sometimes. Using a late 2013 MBP Retina 13" for a couple of days now.

RMBP - external screen turns black for a few seconds every once in a while

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