symdaemon / CPU / 7.3.1

Recently experienced increasing problems with my Mac and have traced it to SYMDAEMON taking up 99% of the CPU after booting up. I have removed and reinstalled with no difference.  I have now removed Norton until I get a resolution to this as it is getting in the way of me doing my job.

The most obvious impact is on using the web browser which just won't load.

I can see this has been a problem for many years but is there a resolution or do I need to remove Norton completely?

Thanks for reading