after getting the upgrade from the followers, if you go into a casino with a weapons check and leave the casino, ed-e will be frozen in place every time you become engaged in combat and there's no way to get him to move unless fast travel and even then he will become glitched again, SO DON'T BRING HIM INTO ANY CASINOS!

this is such a broken game...

actually i also just tried making it wait outside while i went into the casino, still glitched. you should probably fire ED-E if you're going to the strip after you've upgraded it.

EDIT: Arcade's weapons are missing too, It seems the gomorrah doesn't give back weapons to companions. -_-