Music and Sound cuts / Pitch Changes - Random Issue

Hi Guys,

I was wondering if someone could help me.
Here are the issues:
They happened with Unity 4.6 and also happen with Unity 5.1.1f1

First one:
- I play a music introduction on the main page. When I load my first level, the music has distortion just before loading the level (I guess this is happening when the level initialize). It looks like the music speed up or slow down. What would be the best solution to avoid that problem?

Second one:
- I use audio source for my items (pick up items, attack sound, spells, etc.)
Frequently enough so we can hear it, the sound cuts like it'S only playing the first 0.2s.
The sounds are 3d sound, not too compressed and in wav format.

Thanks for your help!

 

Anyone has an idea or suggestion?