FS-4 Sparkle and Crackle problem

I just started using the FS-4 with my DVX100 in the past month. It's been working great until I experienced a problem with some footage today.

That is the problem is only on the second half of the days shooting. It looks like dirty heads - there are little digital sparks every few seconds randomly scattered over the frame. Accompanying the sparks is a crackle on the sound track - both tracks - internal mic and external mic on the second channel.

The tape copy is perfect.

Can anyone put me to the wise as to what might be the causing this problem?
 
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