disc not burning

Hi, I have read many articles on here but none seem to help. I want to create a Blu-ray dvd but I get the dreaded 66% hassle, I've emptied the cache etc and I've tried saving to hard drive on all three of my iMacs but still I get 66% and it stops. If I burn just as a DVD then I have no problem but the quality isn't as good. the file is 1080p and if I stream it then the quality is excellent but I need to burn copies to Dvd disc's has anyone any ideas why this is happening please, Thanks in advance

Might be something beneficial in these two posts I made on the subject of disc burning, both DVD & Bluray. Particularly note bumping of the bitrate from 4.5 to 9.0 / 16 to 26 (DVD/BLURAY) for maximum quality. There's little to control when rendering a disc direct from a timeline and it often craters on me when I try. (All my Blurays are mastered from ProRes 442. A 45GB file masters in 19 minutes. Anything mastered from h264 files takes 3 to 4x longer.)

fcp.co/forum/4-final-cut-pro-x-fcpx/3635...from-timeline#118974

fcp.co/forum/4-final-cut-pro-x-fcpx/3612...timeline-to-blue-ray