Hi there! I understand you're having a buffering issue when trying to watch videos or claim extra points in the Zen Word app on your iPhone with iOS 18.6.2. I'd be happy to help you get this sorted out.

To start, could you tell me a bit more about the situation? For example:
- Are you connected over Wi-Fi or mobile data?
- Is your internet connection generally stable and fast?
- Does the buffering happen all the time or just at certain times?
- Have you tried any troubleshooting steps so far?

Once I have this, I can guide you through some helpful steps.

Meanwhile, here are some general fixes for video buffering on Zen Word app we can try on your iPhone:

1. Restart the App: Close Zen Word completely from your app switcher and reopen it. This clears temporary glitches.

2. Check Internet Connection: Make sure your Wi-Fi or data connection is strong and consistent. Switching from Wi-Fi to mobile data (or vice versa) can sometimes help isolate the issue.

3. Restart Your Device: Sometimes a simple reboot of your iPhone cleans up any network or app hiccups causing buffering.

4. Update the App: Go to the App Store and check if you have the latest version of Zen Word installed. Outdated versions could have bugs affecting video playback.

5. Clear App Cache: While iOS doesn't have a direct "clear cache" option, you can delete the app and reinstall it to reset cached data. Just make sure your game progress is saved to your account or backed up before uninstalling.

6. Reduce Video Quality: If the app allows choosing video quality for rewards, picking a lower quality stream uses less bandwidth and can reduce buffering.

If after these steps videos still buffer, it could also be a temporary server issue from Zen Word’s end. According to some recent user reports, they are aware of video buffering errors and working on fixes8.

Could you try the above things and let me know how it goes? Are you currently connected to Wi-Fi or mobile data? That will help me narrow down next steps!