We believe it happens because of packet loss.
A few months ago my friend couldn't even log in without going LD, but it appeared to him that his internet was perfectly fine. Websites loaded fast and downloads completed successfully and without errors. I had him go to pingtest.net and check things out. It turns out he had 20% packet loss. A week later the cable company re-ran the lines in his neighborhood and everything has been perfect ever since.
It also happens A TON to my friends when they are using a phone for connection. (LAN style play minus the pain of getting an IP exemption!) It seems cell signals lose quite a few packets. Verizon seems to be the best for P99. Followed by Sprint and then T-Mobile. None of us have AT&T. (thank god!) All our phones are Android (CyanogenMod 7) and tested from the same house on multiple (20+) occasions.
Approximately 70% of the time when they go LD it happens on a zone line. It seems like there is a greater risk there for some reason.
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