NSS for Xfinity Stops working - Requires Reboot

Running Windows 10 with Norton Security Suite for Comcast and using Norton Identity Safe with Chrome browser.  A number of weeks ago I noticed that Identity Safe would stop working.  When I tried to open NSS nothing would happen.  I needed to reboot to get everything working again.  During the reboot I would see an error message:

"WatchThread: n360.exe - Application Error"

"The instruction at 0x0000000000000001 referenced memeroy at 0x0000000000000001.  The memory could not be written."

I unistalled Norton using the Norton Removal Tool and reinstalled.  This did not fix the problem.  I contacted Norton Support via Chat and they did the same thing I did - twice.  They said if this did not solve the issue then they would escalate to the "Senior Team".  I tried to do the Chat thing a third time and requested it be immediately escalated.  This resulted in a 30 minute wait for someone from the "Senior Team".   So I've given up working with Norton. 

This happened again yesterday.  I opened up the resource monitor in Task Manager an noticed my CPU and Memory usage were maxed out at 100% and my hard disk was very active.  I immediately rebooted and unistalled Norton and am using Windows Defender with Malwarebytes. 

Any thoughts as to what is going on and how to fix?