i have 3 computers (two windows 10, one windows 8.1) all 3 don't have skype installed. but on my RT-AC87U router am noticing skype activity

i know this month so far it's around 2-3MB, but last month i was 40MB~.
i formatted the desktop computer thinking that'll solve it for the desktop computer but it hasn't...
done a full virus scan on all 3, using Windows Defender and then did another full virus scan using Kaspersky Total Security 2016, found nothing.
is this a Microsoft thing now?

i know this month so far it's around 2-3MB, but last month i was 40MB~.
i formatted the desktop computer thinking that'll solve it for the desktop computer but it hasn't...
done a full virus scan on all 3, using Windows Defender and then did another full virus scan using Kaspersky Total Security 2016, found nothing.
is this a Microsoft thing now?
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