Audio and Video out of sync after rendering in Rush

Newbie here. I'm having trouble with the audio and video slowly creeping out of sync after rendering/exporting. The audio is fine at the beginning of the clip, but by the end (around 13 minutes) it is 3-5 seconds off. I have tried different settings for exporting, but none seem to help. The original footage was captured using StreamYard, and I didn't move the audio track at all. (Just added a bit of music to the beginning and end with a graphic.) The audio and video are perfectly in sync in Rush before rendering. I've read through the answers to similar problems, but they all seem to be geared towards Premiere - The settings I'm seeing are different. Thanks in advance!!