Internet access problem

At about 9:30 AM CST, my internet started acting up, and I lost internet connectivity. I noticed on my Arris modem that the Internet light was off, so I rebooted, and also rebooted my connected Netgear R8000 router. The internet came back, but I was only able to access certain sites. My work related sites were not accessible.  I checked for outages, none were reported in my area (Coal City IL). I was able to access an xfinitywifi hot spot and everything seemed to work normally from there.  

At this point I reset everything again. Nothing changed. I attempted a factory reset of the modem. Still no internet access. The modem had been in in bridge mode prior to the reset, but after the factory reset I could now access the wifi on the modem, and it shows no internet access when connected to my PC. Also no longer seeing an hotspot as an option, currently using a phone as a hotspot for access. The Online light is on the modem, and my router indicates that the internet access is there. I tried calling the Comcast line, and could not get through to even go on hold for a person. Not sure where to go from here - any ideas?