After testing I have found that a profile I was using with SPAD appears to be making the HSI jump radials every few minutes. After dropping all addons and it still happening I shut off SPAD and it stuck where I set it. Once I restarted SPAD the radial jump. Creating a blank profile leave it alone. Resetting up all the controls it's still rock solid. So not sure what in the other profile (a generic one I use for multiple turbo props) is making it do it. But sourced the issue now......SO much nicer to fly now!