I've noticed a couple of times months apart that the remote radio buttons on the steering wheel have started to behave funny. It's lasted a short time then it's fine again. The buttons on the radio itself always work properly but the remote has a mind of it's own. The sort of thing that happens is that pressing volume up changes the radio station. Pressing mute does nothing but changing the station causes the radio to go mute. It's happening more and more and disconnecting the battery for a few hours hasnt stopped it happening. Not the end of the world but the buttons on the radio are so small that it's dangerous to try using them when motoring. Any suggestions please.