Prevent media cache files and media cache database from switching locations

Premiere works best for me when Media Cache files and management go to my external.  Yet, if I open up a project with a different preference, it moves it my internal HD without warning.  There is a major drop-off in speed and always takes a while to figure out.  

I propose locking the media cache to a location and if the software wants to switch or can’t find your current location, it needs to prompt the user to alert them to the switching of the location.  

Would save me a lot of pain.