Avast Resource pinning my Disk usage

I am having a problem with avast resource (not the Avast antivirus program per se) using a lot of disk resource. I’m not sure what is causing this, but it really bogs down my machine and doesn’t go away quickly enough. I have had to end the process.
Any ideas how I can prevent this from occuring again? Is there a setting I can change in order to prevent it - it seems like some background task since it is not the program scanning

thanks

What os/sp?
What exact version of avast?
Got NG installed?

win 8.1
version 2021

what is NG

Latest avast version is 2015.10.0.2208