NFC stops working after a few minutes?

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Gordon
Have you tried with an up to date firmware? I just did:
```
NRF.nfcURL('https://www.google.com');
NRF.on('NFCon', function() {
  digitalPulse(LED1, 1, 250);
});
```
And the red LED flashes as expected.

Could you try forcing NFC off on the troublesome one with just a NRF.nfcURL(); without arguments, then turning it back on? Or totally disconnecting the battery then reconnecting with the button held down for ~4 seconds might help.

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