Tylerhayles

i have a 2003 sl55 amg
when ever i turn the car on i have to manually turn the radio on! And same when i turn the car off i have to turn it off but when im driving if the radio is on every 20-30 minutes i have a message pop on saying something about audio command and system will dhut down in 3 minutes! The radio then turns off after 3 minutes then i have to turn it back on, anyone every come across this problem or someone that can help thank you