Hello! I understand that Map My Walk has locked up for you and is not allowing you to save your activity or reboot the app. Let's work together to get this sorted out.

First, just to confirm a couple of things:
- Are you experiencing the freeze during or after a walk?
- Have you tried force closing the app yet?
- Is your iPhone connected to the internet when this happens?

If you haven’t force closed the app yet, here’s how to do it on your iPhone running iOS 18.4.1:
1. Swipe up from the bottom of the screen (or double-click the Home button if your model has one) to bring up the app switcher.
2. Find Map My Walk in the list of open apps.
3. Swipe the Map My Walk app off the screen to force close it.
4. Wait a few seconds, then reopen the app.

Next, if the problem persists:
- Check your internet connection (Wi-Fi or cellular) and try toggling it off and back on.
- Ensure your Map My Walk app is updated to the latest version from the App Store.
- Restart your iPhone to clear any temporary glitches.

If after these steps the app still won’t let you save or is frozen:
- Log out of Map My Walk and then log back in, which can refresh your account’s data.
- As a last resort, uninstall the app and reinstall it to reset its data (make sure your walk data is synced before doing this to avoid losing progress).

If you want, I can guide you through any of these steps in more detail. Are you able to force close the app now, or has something else happened that I should know about?

App locked

Thank you for letting me know the app is fully locked up. Just to clarify, is the Map My Walk app completely frozen on your iPhone screen with no response to taps and can’t be closed or saved? Or do you see any error messages or prompts when it locks up?

Since it sounds like the app is not responding at all, let's try these steps to safely regain control:

1. Force close the app:
- On your iPhone iOS 18.4.1, swipe up from the bottom of the screen and pause to open the app switcher.
- Find the Map My Walk app card.
- Swipe it up off the screen to force quit.

2. Restart your iPhone:
- Hold the side button and either volume button until the "slide to power off" slider appears.
- Slide to power off.
- Once off, press and hold the side button to turn the phone back on.

3. Open Map My Walk again and check if it works fine now.

If force closing doesn’t work because the phone is stuck or unresponsive, then try a forced restart:
- Quickly press and release Volume Up button.
- Quickly press and release Volume Down button.
- Press and hold the Side button until the Apple logo appears, then release.

After rebooting, make sure your app is up to date by checking the App Store.

If this problem keeps happening or if the app locks after you attempt saving, there might be a deeper issue like corrupted app data or account sync problems. In that case, logging out and back in or reinstalling the app could help. Before reinstalling, make sure your account data is synced online to avoid losing any saved walks.

Does the app remain locked after trying these steps? Let me know so I can guide you further or escalate if needed.