@Carl 

Odd. As shown in my screen shot it was showing the firmware being up to date.  I went ahead and updated to 1.1.5 with no issues. I'll wait and see if it happens again.  FYI, it's been rock solid since I originally posted on the 10th, so when it happens is completely random.
Thank you for your help!

  @Carl 

Strange. I had no issues since my original post over a week ago. I did update to the latest firmware last Thursday and had no issues until today, almost a week later. I happened to glance down at the router and noticed both the Internet and WAN LEDs were off, despite the fact that I was still connected to my office VPN and still able to browse the web. I attempted to connect to the router's web interface unsuccessfully a few times in the hope that I could view a log, but it always timed out before it was able to load the page. I did try pinging the router, which worked with no issue. (Reply from 192.168.0.2: bytes=32 time<1ms TTL=64). I also tried disconnecting the cable to the main router thinking it might reset, but that didn't do anything, so I ended up restarting the AX21.

I have no idea if this unit is still covered under warantee as I puchased it used a little over a year ago. Personally I don't think the unit is defective, but I think there's something else going on that I'm not able to identify as I'm unable to review the logs when this issue occurs.

  @Carl 

Nope. I never touched the LED settings. The other lights were on, just the Internet and WAN LEDs were off.