If I, "Hey Google, take a note," and then speak the note, device responds normally. If I then say something like, "Hey Google, turn on the kitchen," it responds, "Saving your note." This does not appear to be a Continued Conversations bug since it can be a minute between interactions. If I wait a minute and say, "Hey Google, turn off the living room," it once again replies, "Saving your note," and saves the command into Keep. Started happening on Jan 5 (I am in the USA). It eventually starts working again but I can't figure out how to fix it myself.
Now I avoid using my devices to save a note to Keep since I don't want to be locked out to other functions.
Update it happens on my Pixel phone as well! Argh!
Sorry to hear about the trouble. I wanted to follow up and see if I could be of any help. Do you mind me asking if you have tried to reset the device? Are you getting any errors? Please let me know if you are still having any trouble from here, as I would be happy to take a closer look and assist you further.