[Q] Rooting and stock: Official and Custom device status

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Strange thing...

I successfully rooted with the Framaroot method.
I think it's one of the most discreet rooting method since it doesn't require to modify the recovery nor to flash anything with Odin.

I think it just uses the Exynos exploit in some way, and since my stock firmware JB 4.1.2 (N8000XXCLL3) is not one of the more recent ones (that probably fix the exploit) I could root with it.

After that I could happily see that my device status was still "Official".

I checked that well after rebooting more than one time. I also checked that the status was "Official" also in "Download mode".

Anyway, after a couple of days of normal usage (I didn't do anything strange with the root, apart from accessing some system file) I saw that my status had changed to "Custom" .

My suspect is that there's some Android service that periodically (yet infrequently) checks for a rooted device, changing the device status accordingly if it finds some trail of root.

Stranger yet is that, upon rebooting once again, my status has now come back to Official

So... does anyone knows better what triggers the device status from Official to Custom and back to Official when there's no modification in the stock Rom?

Exynos exploit changed mine to custom, tried 3 times to get rid of it, always went to modified then custom after a few minutes/ hours. I'm cool with it tho, doesn't hamper what I do with my note. I've seen others reporting similar scenarios