Intermittent issues with Modem and Asus GT-AC5300

Hi All, I am having a strange issue where I loose internet connection every night and morning around the same time.  I have a motorola SB6190 modem and behind it, an Asus GT-AC5300.  The asus router looses the wan IP and the modem goes offline.  I believe the router is getting blocked by comcast?  

Acquire Downstream Channel / blank

Connectivity State / blank / LOCKED

Boot State / OK / Operational

Configuration File / OK / Operational

Security / Enabled / BPI+

DOCSIS Network Access Enabled / Allowed

i can post the rest of the upstream / downstream bonded channels shortly. 

please help!

thanks,

Mercedes