So I just had this again and spent some more time troubleshooting. In my case it turned out to be the Fenix application! Soon as I killed it, the regular every couple of second stutter went away. Restarted it and all was fine still.
So I don’t know if you use/fly the Fenix A320 or if you had the app running at the time but it seems there might be some bug in the app that causes it to get in a messed up state and restarting it (you have to fully exit it, not just close it because it goes to the notification tray) fixes it for me.