Its seems out of what ever reason the download connection between the two is interrupted and the download restarts. Since the segment size is 16K this happens every 16K. Raising the default segment size and target time might help.

You don't need small segments on LAN anyway. Download speed should be so high that you can easily use values above 1MB, and since you most likely only have one source segmentation, which enables swarming, is not necessary anyway.

The other question is why Phex looses connection, or thinks at some point that it cant use persistent keep-alive connections.

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