I've been having this issue with the radio dropping reception, mmi saying unavailable. Some days it happens a few times for few seconds before it comes back and on some days it's mostly the whole time. It seems that it's only the DAB radio that is affected and not the FM. I was initially thinking that tinkering with the OBDELEVEN has caused some issues but today I found the cause. I have dual DVD sceeens for the kids plugged into the rear lighter socket. When I unplug then the radio works fine. So they seem to be the cause however I don't know if it is due to the electrics from lighter socket interfering or do they maybe produce some frequency that blocks the DAB signal. Has anyone come across this before?