Many ISPs "upgrade" their customers by sending them a new modem, most likely using the newer DOCSIS 3.1 standard. MoCA frequencies interfere with DOCSIS 3.1, so you need to connect a filter to the back of the new modem (in addition to the PoE filter). If you don't, you'll either get very slow speeds or the internet just won't work. These filters worked great and now everything is fine.
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