A week ago, we reported that more Google Map Reviews went missing. Google actually said, for some there is a bug but for many others, they likely won't return due to Google taking a "stronger stance against spam and other forms of abuse."
As of this weekend, some have been reporting their reviews are back.
As of yesterday afternoon the 10 missing reviews have returned. They went missing sometime early on Monday, 11/8 and I noticed that they had returned as of late yesterday afternoon, 11/10.
Googler, Cecelia replied to a thread saying:
Glad to know that many of the reviews have been restored. For those of you who are still having trouble responding, please know that I'm looking into this.
Thanks for the updates and examples.
With any step up in spam prevention, some non spam items will be hit. So feel free to let Google know so they can review them manually.