I'm running kdenlive in Linux Mint 17. Sometimes (particularly with long videos), the project monitor output and the audio will freeze, as if the video clip has ended, but other audio tracks will continue playing (not a crash). I suspected at first that there might be a problem in the original recorded video, but VLC has no problem with playing the entire length of the video, and openshot doesn't seem to have any issues, either (I would prefer not to use openshot if possible). I wish I could give specific circumstances in which this happens, but it happens the most when the video is 2+ hours long, and it typically happens around the 14 minute mark.

Any ideas on how to troubleshoot this problem?