Obligatory 4.2 yakju build link: http://android.clients.google.com/packages/data/ota/google_maguro/fdf06e8d71c7.signed-yakju-JOP40C-from-JZO54K.fdf06e8d.zip
Just had a similar issue setting up a brand new Pixel XL that started on Android N, 7.1.4.
I did the following steps straight from the box:
Booted it for the first time and completed the setup with minimal settings (no wifi, no SIM, etc)
Whitelist googletagmanager.com and/or googletagservices.com in AdAway, kill the Allo process (if it has a background process) and it should go away. Looks like G...
Been noticing the same thing for the last few days or so.