Don't worry if you can't access Premium features. Simply follow these steps to resolve the said issue:
- Check your Internet connection.
- Make sure your subscription hasn't expired. Tap device Settings > iTunes & App Store > Apple ID > view Apple ID > Subscriptions > choose the app and check the status.
Hope it helps, and you'll enjoy Premium features to the fullest. If you keep having this issue, feel free to email us at email@example.com.