Selecting the key frames and setting them to linear tangents unfortunately had no effect on the problem area. I appreciate the comment though.

I ended up doing some digging and found this information which ended up resolving the issue.

"I know this has to do with deleting keyframes in the timeline, but I'm not sure how EXACTLY it happens either. The only fix I could find is making a keyframe of the entire model, and pasting it at the end of the clip to remove the strange movement, though, you'll have to work around it for the rest of the scene."

Hey,

I've been working on an animation, and I noticed some really weird and chaotic lines in the Graph Editor near the near of the animation clip. See the imgur link below, the lines just go crazy out of nowhere.
http://imgur.com/a/13ImD

I want to increase the length of the animation, but when the animation gets to that portion, models get all warped and vanish from the scene.

Does anyone know how to resolve this issue? Right now it's preventing me from working on my project.

Any help is appreciated!