Failed to get the latest IP

[sx1923]

I open the browser to view “https://diafygi.github.io/webrtc-ips/” on telephone，the correct IP address can be obtained by the first run .
But when the real net environment has changed , real ip has changed ( it is easy to change network environment on mobile phone ). I refresh the browser , only can get the old IP address , not the latest one .

How to refresh the WebRTC Connection? I set RTCPeerConnection .close when I got IP，but it doesnot work.
Please help me. Thank you very much!