@stephenw10 No, not a slow disk... It's a SATA III SSD... It was a budget build, but more than adequate for what I'm doing.
https://www.newegg.com/kingston-a400-120gb/p/N82E16820242399?Item=N82E16820242399
This does seem to have stopped the issue, so I'm going to wipe/reinstall NTOPNG, and leave it disabled. I can enable it if I want to do some troubleshooting, but in a home environment, it doesn't justify the wear and tear on the SSD to run all the time.
If I can do anything to help troubleshoot why it would kill the browsing altogether, let me know. I appreciate the insight into figuring this out. 👍