My Arris SB8200 Showing Green Downstream light all of a sudden

All,

Yesterday I noticed that all my modem lights are green (including my downstream light).

Before, downstream light used to be blue (suggesting that it was connected to DOCSIS 3.1.

I'm not sure why all of a sudden it shows green light.  I try re-starting the modem. When it restarts, downstream light will show blue, but will only last for about 2 to 5 minutes, then reverts back to green light.

I have XTREME Pro service with up to 600MB/s down.  I do not have any issues with download and upload speeds as I get consistent around 700 UP and 23 DOWN.

Any suggestions as to why my modem does not show the blue downstream light anymore?