Kdenlive will no longer finish rendering

I booted it up today, nothing out of the ordinary. I usually boot it with the "sudo kdenlive" command. I hit render on a video, and left it up for several hours. And it stopped at 70. I killed it and tried it again. Stopped at 73. Rinsed and repeated, tried this process several times and the program cannot render a simple 5 minute video. Please help.