Exactly my thoughts @ChristopherSpitler. See Surf SOHO MK3 never finishes connecting to cable modem if modem reboots, that summarizes what I went through a couple years back.
So base on the firmware hardware and firmware version you have you may still have the bug they had then, where some internal network MACs leaked out on the WAN occasionally. Even if you have a newer firmware, I noticed that occasionally some internal MAC addresses leak out on the WAN during the boot sequence. So my recommendation is first boot the router. And when it is fully booted, reboot the DOCSIS modem. With a recent firmware that doesn’t leak out MAC addresses from the LAN on the WAN, you should be fine if this is the issue you are experiencing.
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