We're using a Panasonic ES20DEB

When you put in a new DVD-RW it tells you it's unformatted as always, and gives you the option to format. It does this without problem (although the progress bar does stay in one place) and says the formatting has been completed.

When we then ask it to record on the disk it tells me that the disk has not been formatted correctly?

Any Ideas? It's worked fine for a year, it's not near a heating source and does not make any strange sounds.

Many Thanks

Greg