I've just got a 2010 Mercedes E class saloon, and every now and then over the past 3 weeks of ownership the boot goes mental. It sometimes start to pop open and I can actually hear the solenoid clicking while the boot is open too as if I'm pressing the boot release on key fob. It's driving me crazy but I've discovered that if I wrap the key in tinfoil or take the battery out it stops happening then as soon as put the battery back in or remove from tinfoil the boot starts to pop open again. I'm thinking the keys broke. Does anyone know if this is common or not and if I can fix it or if it needs a new key from dealers?. Many thanks.