Q: No sound on videos while in concert...

Hi community !

I recently had some issues when taking videos with my iPhone 6, with iOs 9.2.1...

While in a concert, all videos I take are always "mute", no sound recorded.

But when I try to take a quick video afterwards, the sound is back on... (didn't change anything, my phone is always on silent mode)

Do you have any solution for that problem ?

Thanks a lot !

Dav