I do not understand what's wrong : I burn my backups the same way as usual with the same application and the same dvd media, but still my xbox doesn't recognize my disc anymore.
I'm sure that there is nothing wrong with my xbox, because my dashboard loads fine.
I have an X-ecuter 2.2 Lite plus and I use the latest UnleashX dashboard.
my guess is that the dvd drive is dirrty or starting to go. Either that or your media is breaking down...but that's notn likely.
Check to see if the disks that are faulty are dirty or sratched...then if they aren't open your box and clean out the dvd drive. (you could try a lazer cleaner)...if that doesn't solve it then I'll go with the dvd drive starting to go.