Monzo and crypto

Hi I live in England and I don’t really use my monzo other than buying crypto or when I’m on holiday. I’m going to sell one of positions and withdraw about £9000 to which I have never had that amount on my monzo card before, do you think monzo could freeze that money and not let me withdraw to my main account? As I’ve heard some horror stories where monzo shut down peoples account with money on for no reason. Would appreciate any advice thanks.