on fresh windows 10 cavwp.exe using 50% of disk activity constantly and its on stateful without unrecoginzed files…
Most likely cache building. Check the instance of cavwp.exe and check if it has either -embedding or -cachecleaning flags passed to it. If caching is not worth it too you, you can disabled it, see here: Real Time Scanning Software, Virus Protection | Internet Security Help
Can you check with Resource Monitor and see if you can see what it’s doing?
nvm 10 min after i posted topic it stopped so it was cache builder… but thnx anyway 
You can check with the Tasks log to confirm it was indeed cache builder.