Bug Navmesh Agent Randomly Stops Working

Hello. Upon setting a destination for my Navmesh Agent, if the destination is higher or lower than the current position of the agent, sometimes the solid red line turns into a broken line, and the agent just walks forward into a wall or in whatever direction it was facing when the line became broken. The path is not broken or incomplete.

Here is a picture displaying the broken line.
It SHOULD follow the green line down to it's target, but instead it just keeps walking in whatever direction it was when the line went from solid to broken.



Any idea what is causing this? And how to fix it?

 

EDIT: Never mind, solution did not work as expected.

EDIT 02: Real Solution