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Inserting a tap between ISP modem and router kills the Internet

I bought a network tap (Q-Linx 10/100/1000) and have used it to capture traffic between my laptop and the router. However, when I try to insert the tap between the ISP modem and the router to capture all my home network traffic, the modem immediately stops and I lose the Internet.

I have 1-gig fiber to the modem and Cox wifi router.

Thanks in advance for your insights.