Yeah, I outfit my companions with Chameleon armor and I have my ninja sneak on, dismantling every trip wire and tip toeing in the bushes with my super suppressed gun sneaking up on some Super Mutants and my companion will start screaming about a Radstag a mile away peacefully drinking from a radiated pond blasting them to bits with missiles...

The poor Radstag was minding its own business just grazing in the forest when ADA engaged it. After watching this and rolling around the floor laughing I finally put the poor creature out of its misery. I felt it was necessary and consider it a mercy killing. I even got the high powered Sniper Laser perk on my robot! Useless in combat.

Just gotta love them companions.  
 
Cant recall how many times I've been sneaking up on some raiders or similar only to have "insert companion name here" go charging after something.  Radstag, molerat or the bloatfly on the other side of the map.  So while they're off charging down that fearsome critter, they've totally blown my cover and I'm taking fire from half a dozen "insert enemy here".
 
Now you've convinced me.  Lone wanderer time.

I can always tell them to 'Stay' but every time I turn around they're right behind me anyway. Companions have no concept of Stealth.

Anyone else having problems with the game crashing? It just crashed on me twice within a hour or so. I don't think it is the driver, been using them for quite a while. The only thing I have changed is adding the DLC.

egainey1981
Anyone else having problems with the game crashing? It just crashed on me twice within a hour or so. I don't think it is the driver, been using them for quite a while. The only thing I have changed is adding the DLC.

I can assume no mods either?   

no mods.

Try going into Steam and verifying your cache.   There might be a couple of files that have gotten corrupted or are missing altogether.
 

I had problems after installing the DLC too. I verfified the cache and still had some weird issues until it seems to have sorted itself out.

I verified, and that seems to have worked.