Yellow pulsing ring at bedtime despite disabling Nightly Promise

[Midwestern]

When we turn off the lights our Nest Protect v2 (hardwired) pulses its yellow ring for 5 seconds or so, despite me disabling Nightly Promise in the app for all the units in our house.  There is no voice or app notification indicating anything is wrong.  Why does this happen, and is there something I should do?

[MetalGlacier · Accepted solution]

It sounds like either the Nest Protect has low batteries or it may have disconnected from the internet; however, it is odd that there are no notifications coming from it or the app. For now I would suggest manually checking that everything is working by pressing the center button and following the spoken instructions. Please don’t hesitate to reach out for more help!

Explanation of light colors: https://support.google.com/googlenest/answer/9243107?hl=en#zippy=%2Cwhen-protect-needs-your-attentio...

How to perform an manual check: https://support.google.com/googlenest/answer/9249840?hl=en