London open breakout

 

Hi,

I am backtesting a London open breakout strategy and what i am observing is te system is working for many years to start failing from 10/2015 to 06/2017 and then starts working again. Is there any reason for that?

 

This EA from CodeBase?
VFX London Breakout - expert for MetaTrader 4

I am asking because the discussion about Market products and the Signals is prohibited on the forum.

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No, in general. I have been testing several EA's and observe the same situation.
 
Must be your data that is not up to par.
Reason: