Yes, I think that you are both on to the solution here. I think that it could be to do with permissions for the Auditor app which are enabled but also 'Pause app activity if unused' is toggled to 'on'. Periodically, I get a notification about permissions removed from unused apps. I have a feeling that recently I had one of these notifications and it may have been Auditor. I am ashamed to say that I do not pay my full attention to these particular notifications, I am just reassured that GOS 'has my back' and I move on.
My phone performs the regular attestation but I never actually open the Auditor app as the function is automated. Could that fact that I don't actually open the app have triggered the removal of permissions? I have untoggled the option. I will find out tomorrow morning if my problem is solved.
Thanks for the input