Radio problem 06 x3 with nav`

[r207]

I have had the retrofit Nav in my x3 for over 2 months now without a problem....i just finished insatlling the oem rear camera and it works perfectly/......my problem is my radio changes stations on its own...now it will switch from one to the other.....then back again...

do i need to maybe recode the nav, it has not been coded since fitting.

please help

thanks
Ross