FireWire issues with external drive in Yosemite

I have just upgraded to OS X Yosemite, and I have an annoying problem with my 500GB FireWire external drive (which I use for Time Machine backups).
Basically, after updating the drive won't show up anymore, neither in the Finder nor in the Disk Utility. I also tried the "diskutil list" command in the Terminal, but it is nowhere to be found. Note that the drive does indeed receive power from the port - it spins - and when I look into System Report --> Hardware --> FireWire it does show up there (but I can't mount it). Furthermore, if I use a USB cable to connect the drive everything works fine, so the disk itself seems to be OK.
The funny thing is that if I boot with the drive plugged in the FireWire port the system mounts it normally. But as soon as I eject the drive, I am unable to mount it again (unless I switch to the USB cable, as mentioned above).
Prior to the update, everything worked flawlessly. For now, I backed up my Mac via USB 2.0, but it's very slow and I definitely don't want to resort to this workaround everytime. And it goes without saying that I don't like having issues with my primary backup device in general.
I already did all the usual troubleshooting (rebooting, resetting NVRAM and SMC, ...), but the problem still persists.
Any suggestion?

I had the same issue on a rMBP 13'', brand new 2015 March.
Two thunderbolt adapter connected: one for ethernet, one for firewire Lacie drive.
and...
even after taking the ext. Firewire on the Spotlight exclude list, and also after disabling sleeping hard drives, I always got the issue.
Until I realized that touching the laptop or moving the screen was immediately leading to disconnection.
Then I exchanged the thunderbolt connectors, and now it is stable and does not disconnect again.
??? Maybe one of the ports is more "delicate" than the other?
Big hardware weakness here...

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    Permissions differ on "Applications/Utilities/AirPort Utility.app/Contents/Resources/wanArrow.png", should be -rwxrwxr-x , they are -rw-rw-r-- .
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    Permissions differ on "System/Library/PrivateFrameworks/iPhotoAccess.framework/Versions/A/Resources/P lugins/MosaicFlipTransitionSmall.IAPlugin/Contents/CodeResources", should be -rw-r--r-- , they are lrwxr-xr-x .
    Permissions differ on "System/Library/PrivateFrameworks/iPhotoAccess.framework/Versions/A/Resources/P lugins/PageFlipTransition.IAPlugin/Contents/CodeResources", should be -rw-r--r-- , they are lrwxr-xr-x .
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    Permissions differ on "System/Library/CoreServices/Front Row.app/Contents/PlugIns/Podcasts.frappliance/Contents/CodeResources", should be -rw-r--r-- , they are lrw-r--r-- .
    Permissions differ on "System/Library/CoreServices/Front Row.app/Contents/PlugIns/TV.frappliance/Contents/CodeResources", should be -rw-r--r-- , they are lrw-r--r-- .
    Permissions differ on "System/Library/PrivateFrameworks/BackRow.framework/Versions/A/CodeResources", should be -rw-r--r-- , they are lrw-r--r-- .
    ACL found but not expected on "System/Library/User Template/English.lproj/Desktop".
    ACL found but not expected on "System/Library/User Template/English.lproj/Library/Application Support".
    ACL found but not expected on "System/Library/User Template/English.lproj/Library/Assistants".
    ACL found but not expected on "System/Library/User Template/English.lproj/Library/Audio/MIDI Drivers".
    ACL found but not expected on "System/Library/User Template/English.lproj/Library/Audio/Plug-Ins/Components".
    ACL found but not expected on "System/Library/User Template/English.lproj/Library/Audio/Plug-Ins/Digidesign".
    ACL found but not expected on "System/Library/User Template/English.lproj/Library/Audio/Plug-Ins/VST".
    ACL found but not expected on "System/Library/User Template/English.lproj/Library/Audio/Plug-Ins".
    ACL found but not expected on "System/Library/User Template/English.lproj/Library/Audio/Sounds/Alerts".
    ACL found but not expected on "System/Library/User Template/English.lproj/Library/Audio/Sounds/Banks".
    ACL found but not expected on "System/Library/User Template/English.lproj/Library/Audio/Sounds".
    ACL found but not expected on "System/Library/User Template/English.lproj/Library/Audio".
    ACL found but not expected on "System/Library/User Template/English.lproj/Library/ColorPickers".
    ACL found but not expected on "System/Library/User Template/English.lproj/Library/Compositions".
    ACL found but not expected on "System/Library/User Template/English.lproj/Library/Favorites".
    ACL found but not expected on "System/Library/User Template/English.lproj/Library/FontCollections".
    ACL found but not expected on "System/Library/User Template/English.lproj/Library/Fonts".
    ACL found but not expected on "System/Library/User Template/English.lproj/Library/iMovie/Plug-ins".
    ACL found but not expected on "System/Library/User Template/English.lproj/Library/iMovie/Sound Effects".
    ACL found but not expected on "System/Library/User Template/English.lproj/Library/iMovie".
    ACL found but not expected on "System/Library/User Template/English.lproj/Library/Input Methods".
    ACL found but not expected on "System/Library/User Template/English.lproj/Library/Internet Plug-Ins".
    ACL found but not expected on "System/Library/User Template/English.lproj/Library/Keyboard Layouts".
    ACL found but not expected on "System/Library/User Template/English.lproj/Library/Preferences".
    ACL found but not expected on "System/Library/User Template/English.lproj/Library/Printers".
    ACL found but not expected on "System/Library/User Template/English.lproj/Library/Screen Savers".
    ACL found but not expected on "System/Library/User Template/English.lproj/Library/Sounds".
    ACL found but not expected on "System/Library/User Template/English.lproj/Library/Voices".
    ACL found but not expected on "System/Library/User Template/English.lproj/Library".
    ACL found but not expected on "System/Library/User Template/English.lproj/Movies".
    ACL found but not expected on "System/Library/User Template/English.lproj/Music".
    ACL found but not expected on "System/Library/User Template/English.lproj/Pictures".
    ACL found but not expected on "System/Library/User Template/English.lproj/Public".
    Permissions differ on "Applications/iTunes.app/Contents/CodeResources", should be -rw-rw-r-- , they are lrw-rw-r-- .
    Permissions differ on "Applications/iTunes.app/Contents/Frameworks/InternetUtilities.bundle/Contents/ CodeResources", should be -rw-rw-r-- , they are lrw-rw-r-- .
    Permissions differ on "Applications/iTunes.app/Contents/Resources/iTunesHelper.app/Contents/CodeResou rces", should be -rw-rw-r-- , they are lrw-rw-r-- .
    Warning: SUID file "System/Library/Filesystems/AppleShare/afpLoad" has been modified and will not be repaired.
    Warning: SUID file "System/Library/PrivateFrameworks/DiskManagement.framework/Versions/A/Resources /DiskManagementTool" has been modified and will not be repaired.
    Warning: SUID file "sbin/umount" has been modified and will not be repaired.
    Warning: SUID file "bin/rcp" has been modified and will not be repaired.
    Permissions differ on "Library/Application Support/Apple/ParentalControls/ContentFiltering", should be drwxrwxr-x , they are drwxr-xr-x .
    Permissions differ on "Library/Application Support/Apple/ParentalControls", should be drwxrwxr-x , they are drwxr-xr-x .
    Permissions differ on "System/Library/PrivateFrameworks/iLifeMediaBrowser.framework/Versions/A/CodeRe sources", should be -rw-r--r-- , they are lrw-r--r-- .
    Permissions differ on "System/Library/PrivateFrameworks/iPhotoAccess.framework/Versions/A/CodeResourc es", should be -rw-r--r-- , they are lrw-r--r-- .
    Permissions differ on "System/Library/PrivateFrameworks/iPhotoAccess.framework/Versions/A/Resources/P lugins/BlackAndWhiteEffect.IAPlugin/Contents/CodeResources", should be -rw-r--r-- , they are lrw-r--r-- .
    Permissions differ on "System/Library/PrivateFrameworks/iPhotoAccess.framework/Versions/A/Resources/P lugins/CubeTransition.IAPlugin/Contents/CodeResources", should be -rw-r--r-- , they are lrw-r--r-- .
    Permissions differ on "System/Library/PrivateFrameworks/iPhotoAccess.framework/Versions/A/Resources/P lugins/DissolveTransition.IAPlugin/Contents/CodeResources", should be -rw-r--r-- , they are lrw-r--r-- .
    Permissions differ on "System/Library/PrivateFrameworks/iPhotoAccess.framework/Versions/A/Resources/P lugins/DropletTransition.IAPlugin/Contents/CodeResources", should be -rw-r--r-- , they are lrw-r--r-- .
    Permissions differ on "System/Library/PrivateFrameworks/iPhotoAccess.framework/Versions/A/Resources/P lugins/FadeThroughBlackTransition.IAPlugin/Contents/CodeResources", should be -rw-r--r-- , they are lrw-r--r-- .
    Permissions differ on "System/Library/PrivateFrameworks/iPhotoAccess.framework/Versions/A/Resources/P lugins/FlipTransition.IAPlugin/Contents/CodeResources", should be -rw-r--r-- , they are lrw-r--r-- .
    Permissions differ on "System/Library/PrivateFrameworks/iPhotoAccess.framework/Versions/A/Resources/P lugins/MosaicFlipTransition.IAPlugin/Contents/CodeResources", should be -rw-r--r-- , they are lrw-r--r-- .
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