Sudden Under Extrusion

I’m having a problem where my prints suddenly start experiencing under extrusion even though the print has been perfectly fine for multiple layers before. Additionally I see that the filament is grinding out in the back of the extruder.

I checked my printer settings based on this guide and they are withing the acceptable limits of 8mm3/s.

Also here is an example of my retraction settings as well.

I’m experiencing this on both an Ultimaker 2+ and Ultimaker 2 Extended. I dont believe there are any problems with the model as it is nothing radically complicated or lots of over hangs.

I’m printing with PLA filament from Hatchbox. I’ve printed numerous other things before and have not experienced these problems before.