pioneer vsx-527

Hi,

I bought a pioneer vsx-527 amplifier with airplay to use with my iPad. This worked well up to some days ago. Now, iPad recognise the amplifier send music during 55sec and stop. The level button on iPad doesn't control the amplifier volume no more. I try it with iTunes and Spotify... I reset the iPad, reinstall it, installed the new firmware on the amplifier... Same result !

The iPad work well with airportexpress and the amplifier work well with my iPod (ios 4)

Somebody experienced the same problem ?

Thanks