If it goes out of sync by about 5 or 10 seconds, it might be a lag problem.
Please see http://www.bandicam.com/faqs/how_to_red ... recording/
* Some questions
1. Could you share your computer specifications? (OS, CPU, Graphic card, RAM, Bandicam version)
2. When do you have the problem?
- When you click the 'Record' button of Bandicam
- or When you playback the recorded video
3. Try 'Rectangle on a screen' mode in Minecraft. Many people are saying that it has less lag in Minecraft
=> Do you still have the problem with 'Rectangle on a screen' mode?
4. Disable 'Secondary sound device'
=> Do you still have the problem?