Failing to use stop-loss orders is a common mistake that novice and experienced traders alike can make. Stop-loss orders are designed to limit a trader's potential loss on a trade, which is crucial for risk management. Failing to use them can result in significant losses, which can be devastating to a trader's account.

1. Overconfidence: Some traders may be overconfident in their ability to predict market movements and may believe that they don't need to use stop-loss orders. However, the market can be unpredictable, and even the most experienced traders can be caught off guard.
2. Fear of being stopped out: Traders may be hesitant to use stop-loss orders because they fear being stopped out. However, it's important to remember that stop-loss orders are designed to protect a trader's account and limit their losses.
3. Lack of discipline: Some traders may lack the discipline to use stop-loss orders consistently. This can be due to emotional trading or a lack of trading plan.
4. Technical issues: Traders may experience technical issues with their trading platform, which can prevent them from using stop-loss orders.