Coding error?

So I have a picture frame I'm trying to print, but for some reason near the top of the build, the extruder head began retracting then began laying down the filament again in a different place. The build came out...ok, but it made the top of it kind of line-y (if that makes any sense). A friend of mine said it could be something with the code or possibly the mesh, but honestly we have no idea. It's also my fourth time trying to print it because the first three times it stopped printing half-way up. I'm printing on a Prusa using Simplify3D if that makes any difference. 

It's getting kind of maddening and if anyone with a bit more experience with this could chime in, I'd really appreciate any tips!   


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