Is the Airport Time Capsule compatible with the Arris Touchstone CM8200

I have had all kinds of problems with my WIFI since getting the Arris Touchstone CM8200. I have always connected my Cable modem to my Airport Time Capsule and used it as a backup for my MAC and a router for the WiFi in our home. If I bypass the Airport, I get download speeds of >900mbps. If I maintain my old configuration I keep loosing internet signal altogether. Please advise

AirPort Express

AirPort Express

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