WAN Miniport (2) suddenly appearing with yellow triangle icon

Last week I was called to troubleshoot a Lenovo Thinkpad that could not connect to the network. Device manager showed the Realtek NIC, a Centrino wireless adapter, Teredo Tunneling adapter, and six listings for WAN Miniport adapter, all of these items with
the yellow triangle and exclamation point. It was not possible to update the drivers, because no network connections were available. Even a wired connection would not work. Whenever I tried to run the troubleshooter, I got the error that the Diagnostics Policy
Service was not running.
After much googling, I eventually tried uninstalling the network devices and rebooting to have Windows reinstall them. This didn't work, as soon as I tried to use the driver, the yellow triangle came back. Finally I decided to reformat back to factory settings.
After reformatting, I was able to add the laptop back on the network, with both wired and wireless connections working. In Device Manager there were listings for Bluetooth adapters, the LAN adapter and wireless adapter, and a single WAN Miniport adapter.
I disabled the option to allow these devices to turn off the computer.
I was able to browse the network and get online to update software.
After I left to do something else, I came back and the laptop display was off, so I had to hit power to bring it back. I logged in, and the wireless connection had dropped. I was able to reconnect, but that shouldn't have happened - it's unusual behavior.
I went to Device Manager and now there are two WAN miniports, and #1 has the yellow triangle and is not working. #2 is working. Again I went to the power options and disabled the option to allow the adapter to turn off the computer.
Now I am wondering what's going on, and if the problem actually is hardware-related and not driver-related. Why was it working OK yesterday and now I'm getting errors again? Is this possibly a hard drive issue? The laptop is less than 2 years old.
I'd appreciate any advice.

Hi,
Firstly, about "I got the error that the Diagnostics Policy Service was not running.", you could start this service to clear up this message:
1. Type "Services" in the start menu search box, press Enter.
2. In the Services window, navigate to the following one
3. Right click "Start" button to make it running.
The next, about the WAN miniport issue, do the following:
1.Open Device Manager.
2.Right-click the WAN miniport (Network monitor) device, and then click
Update Driver Software.
3.Click Browse my computer for driver software.
4.Click Let me pick from a list of device drivers on my computer.
5.Clear the Show compatible hardware check box. From the list than select something that can be removed for instance Microsoft -> Generic Mobile Broadband Adaptor. and click next.
6. Back in the device manager, delete the device that just turned into the “MAC Bridge Miniport” device.
7. Once done removing the bad miniports, restart the computer.
Finally, check the result.
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