May I ask you to try some basic steps and check whether the issue persists?
1. Please try uninstalling unused i.e trusteer rapport or non-trusted Extensions. 2. If you run Java in Safari, so please try disable the java browser runtime. 3. This sounds too easy, but did you clear Safari Caches and Cookies? Sometimes quitting Safari without restoring windows may help resolve issues. 4. Go to Safari Preferences and turn off the autoplay video feature for all sites. 5. If you never clear your Cache the ~/Library/Safari/RecentlyClosedTabs.plist file generates huge file size. Quit Safari and move RecentlyClosedTabs.plist to the trash
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