If it is genuinely a single packet, then I have an alternate theory. I note from http://www.dslreports.com/faq/14520 that PowerBoost works on the first 20MB of a download. At 100Mbps or so, that's about 2 seconds. So that's quite convincing evidence that your packet loss is happening at the moment PowerBoost switches off.
It might be that the switching process takes long enough to drop one packet. Or it might be that Comcast deliberately drop one packet in order to signal the change in bandwidth to the sender. Clever, if mildly distasteful. - Jonathan Morton
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