iPad sound interruption

i'm trying to capture an audio clip with the problem,

but, this happens when i'm listening to anything that is a continuous sound,,, like, Music, games, that the sound is constant.

From time to time the sound mutes, and if i'm wearing the headphones i can hear a clicking sound, like a "processing" sound, i can hear it too when i'm not listening to nothing, just that i can't know if that is the same.

The "bug" or problem comes from iOS 7 since my iPad 2th gen wifi, and i have experienced it all along with my ipad 4th gen wifi3g, ipad air 2 wifi3g and now with the ipad pro wifi3g, but, it does seems to happen more rarely, i feel that since the ipad pro has a big processor it does not need to interrupt the sound as frequently as the ipad air 2 or the ipad 4th.

i will try to record the problem happening live, but i thought i should put this here and see if anyone else has noticed this same problem.