Here are a few steps to help resolve issues of your phone constantly freezing and crashing:

1. Back up your data: Back up phone data including personal files, contacts, messages, photos, music, and other important files.
2. Restart the phone: Sometimes a simple restart can solve freezing or crashing issues.
3. Clear cache and data: Clearing cache and data of phone apps can help solve minor crashing and freezing issues.
4. Check phone storage: Check if your phone storage is full, if yes, delete unnecessary data or files and free up space.
5. Uninstall apps: Uninstall unused and unnecessary apps to free up the phone memory.
6. Perform a factory reset: Perform a factory reset to restore the phone to the factory settings.