20" ACD brightness / Eye-One 2 problem

So I go to do my normal calibration with my Eye-One Display 2 on my 20" ACD and it goes fine, although I am surprised to see that the brightness level has fallen to like, 75cd/m2. So I turn up the brightness to 120, calibrate. Fine. Then I go to do a second profile (at D50) and when it gets to the brightness calibration, it says I'm down to 113cd/m2! What's going on!? Did my monitor drop from 120 to 113 in 2 minutes without my noticing? Or is the Eye-One broken/dead/unreliable? Or am I missing something else..?

Oh - btw - I didn't move the calibrator so it can't be inconsistencies in the backlight unless the backlight is fading uniformly.

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    1-1
    1-2
    1-3
    1-4
    1-6
    2-1
    2-3
    3-6
    4-1
    4-4
    L
    a
    b
    L
    a
    b
    L
    a
    b
    L
    a
    b
    L
    a
    b
    L
    a
    b
    L
    a
    b
    L
    a
    b
    L
    a
    b
    L
    a
    b
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    92
    -1
    7
    80
    0
    5
    66
    0
    3
    48
    -2
    6
    10
    -1
    4
    21
    14
    -49
    42
    61
    42
    74
    20
    64
    35
    24
    23
    39
    -16
    25
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    87,5
    0,7
    -5,0
    77,0
    0,8
    -4,9
    63,2
    0,7
    -4,9
    46,5
    -0,6
    -1,4
    13,2
    -0,3
    -2,2
    21,2
    12,5
    -53,0
    40,2
    58,4
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    18,6
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    62,9
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    -0,7
    -1,6
    12,9
    -0,5
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    20,8
    11,0
    -53,8
    39,9
    58,8
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    19,4
    56,8
    33,1
    21,9
    16,5
    37,2
    -13,9
    18,4
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    87,5
    0,7
    -5,0
    77,0
    0,8
    -4,9
    63,2
    0,7
    -4,9
    46,5
    -0,6
    -1,4
    13,3
    -0,4
    -2,1
    21,2
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    19,5
    55,3
    33,7
    21,9
    16,2
    37,7
    -14,0
    18,6
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    0,0
    0,0
    0,0
    0,0
    0,0
    0,0
    0,0
    0,0
    0,0
    0,0
    0,0
    0,0
    -0,1
    0,1
    -0,1
    0,0
    0,0
    -0,1
    0,0
    0,0
    0,0
    0,0
    0,0
    0,0
    0,0
    0,1
    0,0
    0,0
    0,0
    0,0
    Print Profile/ PhotoPrint
    0,1
    0,0
    -0,2
    -0,1
    0,0
    -0,2
    -0,3
    0,0
    -0,2
    -0,3
    -0,1
    -0,2
    -0,4
    -0,1
    -1,1
    -0,4
    -1,5
    -0,9
    -0,3
    0,4
    -0,6
    0,1
    -0,1
    1,5
    -0,6
    0,0
    0,3
    -0,5
    0,1
    -0,2
    Photoshop/PhotoPrint
    4,5
    -1,7
    12,0
    3,0
    -0,8
    9,9
    2,8
    -0,7
    7,9
    1,5
    -1,4
    7,4
    -3,3
    -0,6
    6,1
    -0,2
    1,5
    3,9
    1,8
    2,6
    9,4
    2,8
    0,5
    8,7
    1,3
    2,1
    6,8
    1,3
    -2,0
    6,4

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    Yann

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