I have an EA that works fine all day but at 18:00 on GKFX, (4pm GMT) it simply closes all open trades

 
I am running a simple EA on 4 charts DAX, WS, FT & NASDAQ.  The EA runs fine all day but at 18:00 on GKFX which is 16:00 GMT time all open trades are instantly closed and any trade taken after this is opened and then closed straight away.  Three of my friends are running the same EA without this problem. Does anyone have any ideas as to what could cause this.  many thanks in advance Peter.
 
No code, no EA name, no settings, no logs. Do you really expect an answer? We can't see your broken code. There are no mind readers here and our crystal balls are cracked.