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Trying to Find Out What's Overloading My Modem/Router

Over the past 2-3 months my ISP modem/router has been acting erratic. Device listing becoming bloated with repeat entries. The login fields on the UI are not allowing me to type the username and password, and the 5GHz wifi is dropping. After replacing the modem and even the ONT box, a tech told me it sounds like a device in my network is overloading the modem. He suggested I use Wireshark. I installed it and ran a capture, but I don't know what I'm looking for.

Any advice would be greatly appreciated.