CM1150V Downlink Light Flashing

I usually just reboot the modem to clear the flashing light.  

Xfinity is totally worthless.  Their answer is to reset my wireless router.   

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FURRYe38 wrote:

Has a power OFF of the modem for 1 minute then back on change the LED behavior? 

Try a factory reset as well...

 

Have the ISP check the signal and line quality UP to the modem. Be sure the ISP provisions the modem correctly.
Be sure there are no coax cable line splitters in the between the modem and ISP service box. 
Be sure your using good quality RG6 coax cable up to the modem. 
Be sure to power OFF the modem for 1 minute them back ON.

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Turning off the modem will clear the flashing downlink light. However, the downlink light will start flashing again in a day or two. :-(

I have a coax splitter between my TIVO box and CM1150V cable modem. I did try bypasing it and connect the coax cable directly to the CM1150V cable modem. Sadly, it did not solve the flashing problem. :-(

According to the CM1150V modem status, my downstream power for all the 32 channels are around +1dBmV and SNR around 37dB. The 4 upstream channels power are around 43dBmV. Both within the recommended DOCIS 3.1 modem specification.

I believe that it's a firmware issue since my internet connection (around the 900Mbps from speedtest.net) and phone line are fine.