When using amps no guitar sound feedback external sounds

I'm using the GarageBand app in my iPhone 5s OS 7.

I am using the PV AmpKit Link as an interface between my guitar and the app.

When I turn the amp monitor on there is loud high-pitched feedback, but there's also sound coming from my room

as if there is some internal mic switch on. This of course would account for the feedback but I don't see anywhere to cut the mic.

In addition my iPod or Siri will open on their own and I have to turn them off and return to the GarageBand app.

Up until a few days ago everything was working fine.

Anyone have any ideas on this?