Womble Product

Hi to everyone, this is my first post on this forum and I'm hopeing my current problem may be solved quickly I am making a dvd containing 85 assorted music videos They are all in AVI format as follows:

Video
Frame Width 512
Frame Height 382
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Audio
Bit Rate 128 kbps
Channel 2 Stereo
Audio Sample Rate 44kHz

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After Wombleasy dvd has done it's job and I play the vob files back I notice that a couple of the vids skip, shortly after starting to the next vid which seems to play ok

In Womble settings I have change the fps to 25 and the format to PAL (16x9) (please note same problem occured in nstc)
To end with I'm halfing the amount vids down to 40 to see if that's goner make any difference This last operation is currently under and going to take about 20 mins apert from that I'm out of ideas can anyone help out this Brit Many thanks.