Another risky scenario we see today is a cae where some brokers refuse to create online wallets where traders can warehouse funds which they do not want to use for trading. The risk here is that if all your funds are in your trading account and there is slippage/gapping of price; it can eat into the funds you didnt intend to use on that trade. Lets say you set a stop loss at 1.1650 and slippage causes the stop to be executed at 1.1600 you lose an extra 50 pips you didnt plan for and that extra loss is debited from the funds in your account. But if you didnt have any funds in your account, negative balance protection would have kicked in and the broker would have been liable.
To manage this risk, if a broker doesnt create online wallets for traders I simply open two trading accounts and use one of them for warehousing unused funds.