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I had this same issue. To use more than 32 channels, you must have a gigabit ethernet card on your computer. Most computers have only 100mb/s card, which will cause the pops that you are describing. Like I said, I had the EXACT same issue, and fought with the settings for a month before trying one last thing. I bought a $15 gigabit ethernet card and installed into my computer. Now I have flawless recordings, quicker setup and routing with the new card.