@MiniSaigon
As you can see, I have merged all the comments into this single thread, now we will be able to gather all your reports and feedback in one single place :eahigh_file:
Regarding your report about the happiness dropping, I will make sure to pass it to our developers and let you know as soon I as I have more information,
Meanwhile. the following information might be interesting for you:
HOW DO I KEEP MY POPULATION HAPPY?
If you fail to keep your citizens happy, they’ll abandon their homes and leave town. There’s one other very good reason to keep them satisfied—the happier the populace, the more taxes you will receive.
Check the smiley face happiness counter on the left of your screen. If the face is less than green, there are several ways to find out why. Opinion bubbles give you advance warning of problems like traffic jams, lack of services, boredom, or a dirty Factory in the neighbourhood. If red exclamation marks appear on the icons on the right of your screen, investigate by tapping them immediately!
Sims love a city with culture, style, and a thriving tourism economy. Choose one or more areas of specialization to boost both population and happiness in your city. There are six to choose from: What identity will you choose for your city? Level Up to unlock all six specializations!
Upgrading an existing residential zone: Upgrading is important to increase your population and also to keep your citizens’ happiness levels up. Wherever you see a yellow hard hat icon, a building is ready for an upgrade. Tap the icon to see the building plans and rewards available, then get manufacturing!
Once again, don´t hesitate to provide any feedback you may have for us. We appreciate it!