I can't be 100% sure it's this plugin's fault, but I don't have many visitors (<100/day) and I don't have other things that would be using CPU when there are no visitors.
My cpanel at random times show 100% CPU or 1GB (100%) RAM used.
It would randomly fix itself. Could it be the file checking of this thing? I always get file altered warnings and when I look at the log it says no files were altered.