This app was mentioned in 3 comments, with an average of 2.00 upvotes
And the Play Store says it has between 100k and 500k installs. I'm not sure where the discrepancy comes from. I know the Play Store does not increase installs when an app is deleted and reinstalled, so it's probably that or some other difference in how users are counted. Google's count is probably a better measure of the number of people who have used the app.
On this page you can see that the NYT VR app reached 100k installs on January 6, 2016.
Turns out it was the NYT VR app putting up those toasts. Uninstalling it fixed the problem for me.
(Check the reviews at https://play.google.com/store/apps/details?id=com.im360nytvr ; many of the 1-star reviews there confirm the same issue.)
Looking at the logcat, they were apparently triggered by connectivity change events, not any actual error.
Links :)