The spring that retains donward tension on the bolt catch arm can get easily bent during routine cleaning if you're not careful.
If you strip it next time for cleaning just take the bolt catch apart and give the spring an extra bend to put more tension on it.
It will stay down even with the rifle upside down, no mag and racking the action.
Mine is on my never sell list. It's ungodly accurate and mine eats literally anything I put in it. I have never had a single stoppage and I've put thousands of rounds through it by now. She is going to need some new springs soon lol Until I see a need though she will just keep going.