When I'm driving around, I also have the RNSE displaying the sat nav.The oem discs seem to only last about 6-12 months before RNSE starts to struggle to read the disc and starts throwing errors and then eventually failing all together. Done this with the 2009, 2011, 2012 DVD. Do you think maybe my laser is scratching the DVDs? I never take it out other than to give it a quick clean when the RNSE refuses to read, some times that fixs the problem temporarily, until I need to start the car up again. I have the MK1 unit.