coax installed extender with intermittent yellow light

I own the Fios router G3100 and have recently purchased the
extender E3200. I installed the extender by plugging it into an unused coax line. The extender did come alive and the light is a solid white some of the time, but I'll occasionally walk into the room where it is installed and see it as solid yellow.

I know that this is an indication that it is too far away from the router when doing an unwired (wifi) installation, but is there any reason why this would occur when using coax? It happens quite frequently. What troubleshooting steps would you recommend?

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