The problem is the media or the driver ?

I have a MATSHITA DVD-R UJ-846 in my iMac G5 iSight and recently, after a year, the driver starts misbehaving: in some cases (not always) while burning DVDs it almost stops at about one third of the DVD making various noises, but after a while it resumes.
During the verification that follows, in some cases the disk is ejected with error message at the same point (roughly one third), and then it is not readable, in others it completes and the disk seems OK.
Well, not really. Again in some cases this disk (after troubled burning and verification OK) is readable by all players I have (2 Macs and 1 DVD player connected to my TV), in others it causes the application "DVD Player" on both Macs to stop with Error Message "try cleaning the DVD" or something alike, but it DOES work on the consumer DVD player.
I used both the Apple 8x DVD-R and some TDK 16x DVD-R: I couldn't do many tests but so far I had the problem above only with Apple DVD-R and not with the TDK.
The questions I have are:
- is this problem more likely due to some deterioration of the drive or to the media I used ?
- I had the feeling that bad disks burning was related with the drive temperature: most of bad disks were burned during (a quite hot) summer and the ejected disks were really hot. I then tried to burn just after switching the system ON to make sure it was not overheated: it seemed to work.
Might the temparature be the real problem in your experience ?
- I also decided to burn 8x disks at 4x to make the burning more reliable. Might this help ?
Or, more simply, I have to get my drive replaced ...?
Thanks for your help.
Piero

Yes. I used both Apple DVD-R (5 Pack 8x) and TDK Inkjet printable DVD-Rs in single packs. Never used media on spindles for DVD. I did for CDs, but I never had problems so far.
For years Apple DVD-R didn't cause any problem. But I have been using this 20" iSight iMac for only one year; before I had a 17" flat panel iMac that always worked perfectly with Apple DVD-Rs.
So basically my feeling is: either I ran into a bad stock of Apple DVD-Rs or into a bad Matshita driver in my iMac... I hope the former is the right answer...
Piero

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