It's known that rain will effect satellitte transmissions. TCP is an ordered tranmission protocol which means each packet is numbered and if one is missing at the other end, it will ask for you to resend it.
However, I thnk it is far more likely that the kids are running limewire or some other downloader that is starting up with windows and chewing up your bandwidth. Bigpong includes uplink in your usage so even though your not downloading, if they are sharing, you are being charged.
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