I hope someone can give me some help with this.. Here is the problem
My Remote works only when it wants to and I have to be right near the sensor on the door handle. But sometimes if I am near that still nothing.. . I replaced the batteries and still the same. I have 2 remotes and have tested them both.... The radio stations come in only sometimes. Everything else works. NAV-CD everything.. Just the radio stations and the alarm remote.. . I have no idea what it is or where to start looking. I was going to bring it to the dealer but want to make sure its not something that I can do.. The car is a 2005 Mercedes C55 AMG… everything is perfect except this issue….

If anyone could help, it would be greatly appreciated…. I am totally new to Mercedes.. My first one..