I would start by changing your media - We have tested RitekF1 dye here - http://forum.imgburn.com/index.php?showtopic=539 and it's very patchy to say the least.
To save your frustration get Verbatim MCC or Taiyo Yuden dye discs, these are the only ones that still appear to be consistently A grade media. If you are in the US you can order them from www.meritline.com or from www.svp.co.uk if you are in the UK or Europe.