WIFI extenders drop connection to Spectrum Technicolor modem/router - Time Warner Internet

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This question is about "WIFI extenders drop connection to Spectrum Technicolor modem/router", with Time Warner Cable internet and apps. I have purchased 3 different extenders. Last one was Prescitech AC 1200 high power dual band range extender. Again after some hours/days extender shows "no internect connection" message. Must restart to get extender to synic back up. I placed one of the original extenders in the same room as the modem/router. I set my phone to this wifi extender. With in a day this also lost internet connection. I am sure that the issue is Spectrum. What would be the information the I need to be sure that Spectrum tech understands what to look for? I still want thier modem/router at this point.

WIFI extenders drop connection to Spectrum Technicolor modem/router?
 
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