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Some sort of sample error or?

I'm, having problems with the data reading. As you can see in the screenshot every once in a while a peak value appear. This peak is represented by only one sample. I'm sure of how the process behaves, and there should not be any of these spikes.
 
Using DAQmx (as in picture), situated in a while loop, surronded by a second while-loop containing the rest och the program.
-Acqusition mode: Continuous
-samples to read: 100
-sample rate 1 kHz
 
 
What could the reason to the peaks be?
Some sort of sample error?
Interruption by any other block or sub-vi. ?
 
(Ask me if anything is unclear)
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sorrry... forgot the pics.
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So?

Does anyone have an idea?

Is it possible to sample to fast ?

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