ConvertXtoDVD skipping & showing boxes

Recently bought and fully updated the latest version of ConvertXtoDVD

I just burned a widescreen video (150 minutes +/-)

It’s skipping, freezing and showing boxes/glitches. All the footage is crystal-clear on the computer, but the DVD looks awful.

As far as I know, the 150minutes shouldn’t be a problem since the total size is about 1.4GB, and the DVD-R max capacity is 4.7GB. Perhaps there’s a setting I’m unaware of on ConvertXtoDVD that bases it on the size rather than the time??

Any suggestions?

Brand of blank DVD? Burn speed?