NIS.exe frequently spikes to ~100% CPU usage

Hi all, I'm using Norton Internet Security version 21.6.0.32 on Windows 7, and since installation it periodically spikes to almost 100% CPU usage at least once a day. This goes on for ~10 mins and prevents me from doing anything else efficiently. I've disabled Insight Protection, and my history log does not show any events corresponding to the spikes.

I've tried searching for solutions but to no avail. Any advice would be greatly appreciated!