2008 mercedes SL 550 AMG. I replaced my Key remote (not a certified dealer) and the keyless start does not work but the ignition start does work. I also noticed that the radio will randomly turn off with a "system not available" message on the radio screen. It turns on when the radio on/off button is pressed but will shut down again in about 1 min. Also the windshield wipers shut off in the middle of the windshield. Before I got the new key, the radio would periodically shut off but the wipers worked fine. I hear a very faint ticking, like a clock when the problems occur. Any advice?