In order to withdraw from Curve.fi, it is important to ensure that the gas fee is set to a sufficient level. If the gas fee is too low, it may cause the withdrawal to fail. As you have experienced, increasing the gas fee can help to resolve the issue. Additionally, it is important to be aware that the link provided by Curve.fi is recognised by both browsers as a phishing link and should not be clicked on. Therefore, it is important to make sure that the link is from a trusted source before proceeding.