Hi! I understand your Daily Themed Crossword app is unexpectedly switching over to Mahjong while you’re using it on your iPhone. That’s definitely unusual behavior. Let’s see if we can figure this out together.

To start, can you tell me if both the Daily Themed Crossword and Mahjong apps are installed on your iPhone as separate apps? Or is it part of one app that offers both games? Also, does this switching happen randomly, or only when you tap certain buttons or perform specific actions within the crossword app?

Meanwhile, here are some basic steps to try that often help with unexpected app switching or crashes on iOS:

1. Force close both apps:
- Swipe up from the bottom of your screen and pause slightly in the middle (or double-click the Home button if your iPhone has one).
- Find both Daily Themed Crossword and Mahjong in the multitasking view, then swipe each one up to close.

2. Restart your iPhone:
- Press and hold the side button and either volume button until the power off slider appears. Slide to power off.
- After it shuts down, press and hold the side button again to turn it back on.

3. Check for app updates:
- Open the App Store, tap your profile icon at the top right, then scroll down to see if Daily Themed Crossword and Mahjong have any updates. If so, update them.

4. Check for iOS updates (since you are on iOS 18.6.2, make sure that is the latest):
- Go to Settings > General > Software Update to see if your phone is fully updated.

5. Check the app settings inside the Daily Themed Crossword app to see if there is any option related to auto-switching games or advertisements that might trigger Mahjong.

Try these steps and let me know if the problem still happens or if it only triggers after a certain step in the app. That way, I can help you dig deeper!