Sunroof, STC, and other odd issues
 

My S80 is having a nervous breakdown. I currently have only my center dash speaker on my radio functioning. I am also suffering from intermitten cruise control functioning. It will completely shut off with no warning and i am unable to turn it back on. I shut the car off and it will sometimes return other times it will not. I have no control of the radio through my steering wheel controls and I am suffering from intermitten STC functioning. Sometimes i start the car and its on other times i start the car and its off. My sunroof worked until yesterday and it has decided it will not work. I also have control over interior lights at times. Other times they will not come on at all. I also have the yellow warning triangle lit but it doesnt tell me anything. I have done the disconnection of the battery several times along with the key in the door. Any suggestions would be greatly appreciated

i took my car into the dealer and told that my amp is dead. Anyone know where i can get one and what options I have? i was told with the age and mileage of my car that it would be too costly to diagnose and that i should a newer model. So since i really didnt get the dealer to do much diagnostics, can someone tell me if they had stc problems when their alarm siren failed?