Spectrum Gigabit service - Netgear CM2000 & Orbi RBK853 Not getting Full 1 Gig Speed

I recently upgraded my Spectrum service to 1gig last month and I was getting the full service speed for a couple of weeks. My download speeds are now pinning at near 100mbps. I've spoken with the spectrum service and they've had me power cycle a bunch of times and do a factory reset, but nothing seems to work. 

One thing that is very strange is that if I power cycle the router, the gigabit light on the modem will flash blue indicating that the gigabit connection is working but my internet service won't resolve any web pages and the router admin page speed test indicates my internet connection is down. I can only get my internet back if I power cycle the orbi again but the connection is back to ~100mbps. 

I've tried three different cat5e cables and checked that all cables are seated well. I've disconnected and reconnected my coax as well. What's frustrating is that this setup was working fine for a couple of weeks and now it's not. 

My question to the community is why would a power cycle on the orbi router, once the modem is online, give me the correct blinking blue gigabit light but my internet would be down? Why would a power cycle on the orbi one more time revert back to the 100mbps connection?

Screen shot of my speed tests attached. 
Seems very similar to this issue: https://community.netgear.com/t5/Cable-Modems-Routers/CM2000-Nighthawk-Router-Not-Getting-Full-1-Gig-Speeds/td-p/2188115