It is popular opinion sometimes that a trading strategy might no longer be effective if one begins to loose money while trading instead of gaining.
An important question i ask myself whenever i hear about people complaining or simply discussing a series of consecutive looses they have made while trading using a certain strategy is;
HOW MANY CONSECUTIVE LOOSES IN TRADING CAN YOU HANDLE BEFORE YOU ACCEPT THAT YOUR CURRENT TRADING STRATEGY IS BECOMING LESS EFFECTIVE?
I personally test a strategy many time on a demo account across multiple days in order to determine that it is worth trying out with real money or not, and one the win outweigh the losses i go in, but in terms of consecutive losses i would do 2 in a row and than come back another day, if see that i am still losing than i would go back to the planning board adjust test and repeat.