My mate has an ongoing problem with burning DVDs and CDs which I have thus far been unable to get to the bottom of, so I'm hoping some kind soul here will be able to through some light on the subject for me!

A lot of the discs he burns (probably 50%) for people come back to him with problems - I've had DVDs from him that get mid-way through and then refuse to play, others won't play past the menu screen.  Interestingly, some players seem to fair better than others with these discs - my Panasonic DVD player struggles, but if I then put the disc in my PS3 it doesn't bat an eyelid.

Things I've tried so far include:

• Install a new drive
• Remove and reinstall both drives
• Try different media (I've also tried the same media from the same spindle as him in my machine with no problems)
• Reinstall all burning software (Nero 7, DVD Shrink)
• Run a full memory test using MemTest86+ (this found no errors)
• upgrade the drives' firmware
• enable verification in Nero - sometimes this does throw up errors, but my friend is adamant that some have not thrown up errors and yet still had problems - also there seems to be no way to enable verification using DVD Shrink

Any help?!

Edit:  I should point out that these problems have only occurred in the last couple of months - the only change since then is that he has moved house and now uses a wireless connection for networking instead of his previous cable connection