I have tap+send setting "on" all the time in the phone. I am using NFC communication to send few messages between two Nokia Lumia 920/820. But after few trials it just stopped working, even when the devices are in proximity of each other , NFC channel wont be able to create ( as the NFC tap sound won't come ) and messages won't be received. To overcome this issue I need to restart both the devices then only it again starts working.

I have faced the same problem with HTC 8x also. Is this the platform issue?

Or is it something related to device energy getting consumed since I have kept the tap+send setting to "on" all the time?