MY expert adviser need help

 

I make a expert adviser ,but at a long time ,it work fine ,but after a time point ,it work worse. any one do can help me?

before 2006-9-20 , it work fine ,and after 2006-9-20 , it work poor . why? some factor affect it? I don't know . need help !!! any help welcome.

Files:
dt4h.mq4  7 kb
 
Strategy Tester Report
DT4H

Symbol EURUSD (Euro vs. United States Dollar)
Period 5 Minutes (M5) 2004.04.26 01:00 - 2007.05.18 23:55 (2004.04.25 - 2006.05.20)
Model Every tick (based on all available least timeframes with fractal interpolation of every tick)
Parameters MaxStop=40; Slip=2; MaxTakeProfie=20; TimeNum=200;
Bars in test 233762 Ticks modelled 5698026 Modelling quality 90.00%
Initial deposit 10000.00
Total net profit 73237.93 Gross profit 229904.39 Gross loss -156666.46
Profit factor 1.47 Expected payoff 0.67
Absolute drawdown 22.20 Maximal drawdown 692.65 (1.58%) Relative drawdown 1.77% (183.00)
Total trades 108688 Short positions (won %) 54717 (66.26%) Long positions (won %) 53971 (62.77%)
Profit trades (% of total) 70130 (64.52%) Loss trades (% of total) 38558 (35.48%)
Largest profit trade 20.40 loss trade -40.58
Average profit trade 3.28 loss trade -4.06
Maximum consecutive wins (profit in money) 29 (61.00) consecutive losses (loss in money) 13 (-74.00)
Maximal consecutive profit (count of wins) 108.00 (20) consecutive loss (count of losses) -189.00 (7)
Average consecutive wins 3 consecutive losses 2
 

but after 2006-9-20 just likt this

 
only for EUR/USD (if FOR usd/jpy  points between bid /ask  should be limit to 2 point )
Reason: