It is better to take a break when a trader suffers a series of losses. When he comes back, a detailed analysis should be done. In case the loss is due to sudden news then risk management techniques need to be fine tuned. If the loss is due to strategy, the trader should trade on a demo account and fix the error. Series of losses normally brings the morale of a trader down. However, it is the ability to recoup himself through analysis matters the most.