I can only offer the following
General troubleshooting tips:
- Update your device software
- Check for any Tapped Out update in store
- Log out/Log back in
- Restart device
- Clear cache
- Free up space (some Apple devices may require 4-5GB free space)
- Hard close the game and restart
- Load on another device
- Try a different wifi/connection/internet/broadband
- Accept or decline any pending friend requests
- Change your password
- If connected to EA/Origin: uninstall / reinstall game (Do NOT do this if you play anonymously)
Synchronise your game often by visiting the friend's screen so your game progress is saved
https://answers.ea.com/t5/The-Simpsons-Tapped-Out/How-to-resolve-crashing-freezing-and-loading-progress-issues/m-p/5716153#M122465
https://forums.ea.com/en/the-simpsons-tapped-out/discussion/80732/how-to-contact-ea-directly/