Problem with ITalk

Hi, I recorded 7 interviews with my Iphone using ITalk. 5 of them are great but two of them --which I made in between-- are just mute.
Any idea on why this happened? And do you think there is a way to fix the problem and recover the audio? Iā€™m so desperate!!! :frowning:
Thanks if you can help me!

You may be able to find help here: http://www.griffintechnology.com/support/italk