Conflicting ISP address - Time Warner Internet

This question is about "Conflicting ISP address", with Time Warner Cable internet and apps. So we have the exact same desktop and 2 laptops. But now we have to constantly reset router/modem that they gave us to use. { Arris.}.. If someones is inside with a cell phone or tablet it connects fine. We have a roku to watch Netflix. Connects fine. But if someone is on the internet and we connect one of the computers it says conflict in isp address.

( These all connect thru wifi... ) and then you cannot connect anything untill you reset the router/modem. I't was not doing before. This is something that just started in the last week. And I don't know why.

Conflicting ISP address?

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