SVCD Audio probs 1 cd ok, 2nd rubbish

I am currently having probs with nero 6, i have looked at the forum and already seen the problem with cd not being big enough so that is one prob out of the way. The other prob i have is i split an avi into 2 peices using AVI MPEG ASF WMV Splitter. I burn the first 1 using nero SVCD with no probs at all. Then i burn the next 1. I go to watch my freshly burned cd’s and shock horror the audio on the 2nd is out of sync. I dont know what to do, the fist 1 ok, the 2nd one rubbish. Please does anybody know how to fix the problem.