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I'm using an Arris SB8200. For the past week or so, the Internet cuts out for 10-15 seconds several times an hour. I've run a recurring ping and it shows it dropping on the first hop from my router. It's not a Wi-Fi issue--I'm on Ethernet--and it impacts multiple devices. I've power-cycled my cable modem, factory reset it, etc. but still have this issue.
If your internet disconnects for 10-15 seconds, it sounds like WiFi interference. If the modem actually went offline, it would take much longer for it to re-sync. What router are you using, WiFi modem/Pano, or your own?
I'm on Ethernet. It's not WiFi. I've also run a continuous ping and it drops one hop after my 192.168.1.1.