Radio problems

Hi Guys

I am new on this thread, and wondered if you could help me.

I seem to be having problems with my E90 BMW professional system, it keeps on cutting when playing the radio, cd and shuttle. as if there is short or something.

first I thought maybe the shuttle is faulty but I would know as I'm not that clued up on these things. sometimes the radio works for a week and suddenly decides to cut as mentioned above.

Do any of you good people know what could cause this.

#irritated non listening music lover

Thanks