That is odd that it would fail after recording 3 or 4 videos. Usually if there is a fundamental configuration or hardware issue the things wouldn't make it that far.
Do you know approximately how long it takes for the application to crash? Is it a number of minutes, hours, or days? Is it always tied to the recording of 3 or 4 videos?
If it is tied to the recording of videos then it may be a memory issue. When launching the application, what is the memory usage of the iCamSource Pro in the Task Manager? After the application has been running for a while, but before it crashes, has the memory usage perhaps gone up considerably?