File sink issues

I am having an odd problem with the file sink. I am inputting a pulsed
into the N210. (~200 ns, 1 us period). The pulse frequency is a 5 MHz
the center frequency. I am running at 50 MSps with a RFX2400. I can see
correct plot when using the FFT sink and the scope sink. I see a short
burst of sinusoidal signal and 800 ns of zero.

However when I use a file sink, I see a 1.5 MHz signal that pervades the
entire stream. I have recorded a signal before without a problem, but
not at
50 MSps. untitled.png

If I look at the abs value, then it appears as if I have a DC offset. untitled2.png

But I am not sure why I only see this problem when I stream to a file as
opposed to the file sink.

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