Hello! It sounds like you're encountering an issue with your nPerf speed test failing due to a network type change during the test. I can definitely help you with this.

First, could you tell me a bit more about your setup? Are you using a wired or wireless connection? Have you noticed any interruptions in your internet connection while running the speed test?

In the meantime, here are some steps you can take to resolve this problem:

1. Check Your Connection:
- If you're on Wi-Fi, try switching to a wired connection to ensure a more stable connection.
- If you're using a wired connection, check the cable for any damage and make sure it's securely connected to your router and computer.

2. Restart Your Equipment:
- Power cycle your modem and router by unplugging them from power, waiting for about a minute, and then plugging them back in. This can help refresh your connection.

3. Disable VPN or Proxy:
- If you're using a VPN or proxy service, try disabling them, as they may interfere with the speed test results.

4. Check for Software Interference:
- Ensure that any firewalls, antivirus software, or browser extensions (especially ad blockers or privacy shields) aren’t blocking the connection. Temporarily disable them to see if it makes a difference.

5. Run Troubleshooter:
- You can run the built-in troubleshooter on Windows. Go to Settings > Update & Security > Troubleshoot > Additional troubleshooters, and then select Network Adapter. This can help identify and fix network issues.

6. Try a Different Browser:
- If you're using a particular browser (like Edge or Chrome), try testing it on a different browser to see if the issue persists.

If the problem continues after trying these steps, please let me know, and we can explore more advanced troubleshooting options! Are you satisfied with the solution I provided so far?