B&W Zeplin docking station

I have a 4th gen iPod that sits permanent on a B&W Zeplin docking station. Since my latest and last iOS upgrade for this older iPod ( think it's 6 ) I have had a few problems like the following... A note telling me this accessory is not supported by iPod touch ( see image ). The sound sometimes only comes out of the iPod and not the Zeplin and it also sometimes does not charge the iPod whilst it's on station. Any ideas? In the past I've had the normal answers from B&W and Apple blaming each other lol.

This sounds a bit like a connection problem. I have a Sony clock/radio with an iPhone/iPod dock which occasionally displays the same message but it has never affected the function of the speakers or charging of my iPhone. I just press OK and it goes away until next time. It might be worth checking your connection port for dirt and dust.

Ok, the thing is there shouldn't be any dirt or dust as the iPod never comes off.