A video problem that puzzle many people

The problem is widely mentioned in the networld that the video will automatically exit when you are watching it (including myself) and it couldn’t continue to be played where the video exits. I really want to know what causes the problem. Is it due to the conversion problem of the software or the original video? As for the conversion tool, I use the free software: Videora iPod Converter. Later on I had a try on Pavtube DVD Ripper. Sometimes the problem comes up and sometimes not, same as using other software. just for the same video, when using different software, or trying different software to convert the some video, the same problem comes up from time to time.

So I want to ask the expert what causes the problem. Is it because of the software clash or the video conversion problem? Many people asked the similar questions but no one answered it to resolve the problem normally. Some people just say that some software is better than others. However, as far as I know, it seems that there is no the problem like this to come up. (I have been using the same software to convert the same format for the movies). I really don’t know what causes the problem.

Is it because of the software clash? Hope that it is discussed by all of you and can tell us what the cause is. Thanks in advance.