Here's the list of things you can do to fix the situation right now: 

Try to close the game and restart it 
Oftentimes, that's enough

Restart your device
It helps clear out minor disruptions

Check your internet connection
It's best to play via stable Wi-Fi. It's also quicker, and you don't waste the traffic

Make sure the game's been updated
To do so, you need to go to your app store

Find out how the system on your device is doing
Sometimes, that's where the issue lies — the system not being up to date. Here's where you can check everything you need:

For iOS devices: Settings → General → Software update 
For Android devices: Settings → System / About phone → System update
Give us permission to track ads
Opting out of that or resetting your advertising identifier might prevent the ads in the game from working properly. To avoid these issues, check the following settings:

For iOS devices: Settings → Privacy → Ads → check off "Limit Ad Tracking")
For Android devices: Settings → Google → Ads → check off "Opt Out of Ads Personalization" (or "Delete Advertising Identifier" if available)
If you're using virtual private networks / VPN or apps with protection:
Some of them might block ads even if it's not obvious. Try to temporarily turn off:
— VPN
— apps for "security" or "privacy"
— browsers with ad blocking

Quick check:
Switch to mobile internet, close the game completely and restart it again.
If you start seeing ads, it means that Wi-Fi is the source of the issue.

If you play via Wi-Fi:
Potentially, there might be a filter turned on in your network (router settings, for example).
Try another network or check DNS settings on your router.

And lastly: 
Make sure there are no restrictions set for the game:
Settings → Apps → Sunday City → Data & Battery
Allow background data transmission and remove strict battery limitations.

This list can work for resolving other micro issues in the game as well. If these methods don't work, contact our tech support — we'll figure out what to do together