B9004 Sat Nav Trouble

[Bald chewbacca]

Hello,

I have (still) a t180 2007 rav 4 . It has a B9004 sat nav system. Up until recently the sat nav has worked fine. It now on a regular basis won't read the map and a message says there is a map DVD error or that no map DVD is inserted. Every now and then it just works as if nothing wrong. I have cleaned the Map DVD. I bought a lens cleaning cd but it doesn't work as the DVD player doesn't recognise it so won't play it so the disc doesn't spin meaning the lens can't be cleaned!!!! The CD player works, the radio works, the bluetooth connection works it just seems to be the DVD player. I want to sell the car but I can't if the DVD/ sat nav isn't working.

Any suggestions ?

Many thanks.