Unable to enter Kadara vault

This happened to me too but only when I loaded the game with mods from Frosty mod manager. The specific mod that was causing the problem is called Increased Player Stats. Just uncheck it from your mod list, launch the game from Frosty, go through the gravity well, close the game, recheck the mod, then launch the game again. It will keep everything, including mods, to work smoothly from then on. If you don't have Increased Player Stats modded in then maybe it could be from another mod that tweaks your health and shield. 

I hope this helps!