I'm following this because I'm having the same issue!! But in my case my old modem works better than the modem I got for gigabit connection. I have yet to see speeds over 200.
my modem sees notging on the coax line.
Is the "Online" indicator light lit steadily ?
Light is steady. Guy in the condo across from me has the same equipment and his download speed at the same time was 900+
You should read this post. Not regarding the modem but regarding the router. I might look into this.
Please start your own new topic for your issue. You are stepping on someone else's ongoing help thread. Thank you.