Why does connecting the ECB cause internet disconnections?

The issue likely stems from frequency overlap or interference between the MoCA device (e.g., ECB6250, 7250), which operates in the 1125-1675 MHz range, and the ISP’s DOCSIS 3.1 operates in the 5-1200 MHz range. This interference can destabilize the modem signal, triggering the ISP’s protection mechanisms and causing service interruptions.