I have had my ilo for a while it is the 04 without the hard drive. I have had it for about 2 years. Recorded hundreds of movies. I have always used the same brand of DVD's. Now it recording movies,and if I do not finalize it right away, it will not finalize. It will say invalid disc. I have used a cd lens cleaner in it, but it still isnt working. It does fine if I watch it and finalize it as soon as it is over. Any suggestions?