This is not an email, which is what I requested, and it is not really focused on details. I'm sorry to hear that you're not enjoying the game, and while I am generally interested in hearing about players' experiences, I'm not able to offer assistance to anybody who refuses to follow instructions.
There is no event that behaves as described. My best guess is that it's referring to a warning notification that is intended to help players identify that there's a potential population issue when the cause has been overlooked.
In case anybody reading gets the wrong idea, significant population declines are not the failure-state this player presents them as. When Beesitter populations are at zero, bee spawn rates return to what they were at the beginning of the game before any Beesitters had spawned. Learning how to recover from these situations and how to prevent them is a part of the game. Some people enjoy this, but it's OK to not. Keep playing if you're having fun. Stop playing if you're not.