Cable modem problem with Linskey router

Every since I got my new Xfinity cable modem installed I could not get it to work well with my Linskey router. The internet has been going on and off due to failure to look up the DNS server. I looked into this previous post and did everything it said:

For a moment, I thought it was fixed until the problem persisted, I don't know what to do anymore, I've tried configuring my DNS server multiple times, and the solution is only temporary.

Someone please help.

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