Kenwood DNX8120 problem

[bpd138]

Hi,
I installed the Kenwood DNX8120 a couple of weeks back and everything worked great. That is, until I installed an Infinity Reference 475a amp!

I only just noticed this problem a couple of days ago because I don't use my phone in the car very much. Anyway it seems that I have lost the audio output when I am using my phone on Bluetooth. I also noticed the Navigation prompts aren't coming over the speakers anymore. When my phone rings or I make a call using the bluetooth my music is muted. People can can hear me when I talk. I just can't hear them.

I have gone through every setting there is (I think) and can't find anything amiss. Anyone got any insight as to what it might be. it all worked great before I installed the amp.

Any help would be greatly appreciated.
Willie