Please help me understand this EA

Hi folks,

I have the following EA free from a google search & have run it several times. Some times it opens a fractional lot trade and sits; other times is opens a flurry of longs and shorts, which it is constantly opening and closing.

Can anyone help me understand why this would sometimes just sit on one position and when it would go into flurry mode?

//+------------------------------------------------------------------+
//| 100 pips a day.mq4 |
//| Copyright 2005, MetaQuotes Software Corp. |
//| http://www.metaquotes.net |
//+------------------------------------------------------------------+
#property copyright "Copyright 2005, MetaQuotes Software Corp."
#property link "http://www.metaquotes.net"
extern int timeframe = 5;
extern double stopLoss = 1000;
extern double lTakeProfit = 20;
extern double sTakeProfit = 15;
extern double lTrailingStop = 10;
extern double sTrailingStop = 10;
extern color clOpenBuy = Blue;
extern color clCloseBuy = Aqua;
extern color clOpenSell = Red;
extern color clCloseSell = Violet;
extern color clModiBuy = Blue;
extern color clModiSell = Red;
extern string Name_Expert = "100 pips";
extern int Slippage = 2;
extern bool UseSound = true;
extern string NameFileSound = "shotgun.wav";
extern double MaximumRisk =0.02;
extern double DecreaseFactor =3;
extern int Lot.Margin =1000;
int init(){return(0);}
int deinit(){return(0);}
int start(){

if(Bars<100) {Print("bars less than 100");return(0);}
if(lTakeProfit<10){Print("TakeProfit less than 10");return(0);}
if(sTakeProfit<10){Print("TakeProfit less than 10");return(0);}

if(timeframe==0) {timeframe=Period();}
double diClose0=iClose(Symbol(),timeframe,0);
double diMA1=iMA(Symbol(),timeframe,7,0,MODE_SMA,PRICE_OPEN,0);
double diClose2=iClose(Symbol(),timeframe,0);
double diMA3=iMA(Symbol(),timeframe,6,0,MODE_SMA,PRICE_OPEN,0);
if(AccountFreeMargin()<(1000*LotsOptimized())){
Print("We have no money. Free Margin = ", AccountFreeMargin());
return(0); }

if(!ExistPositions()) {
if((diClose0<diMA1)) {
OpenBuy();
return(0); }
if ((diClose2>diMA3)) {
OpenSell();
return(0); } }

TrailingPositionsBuy(lTrailingStop);
TrailingPositionsSell(sTrailingStop);
return (0); }//end start
// - - - - - - FUNCTIONS - - - - - - -

bool ExistPositions() {
for(int i=0;i<OrdersTotal(); i++) {
OrderSelect(i,SELECT_BY_POS,MODE_TRADES);
if(OrderSymbol()==Symbol() && OrderComment()==Name_Expert) return(True);
else return(false); } }
void TrailingPositionsBuy(int trailingStop) {
for(int i=0;i<OrdersTotal();i++) {
OrderSelect(i,SELECT_BY_POS,MODE_TRADES);
if(OrderSymbol()==Symbol() && OrderComment()==Name_Expert) {
if(OrderType()==OP_BUY) {
if(Bid-OrderOpenPrice()>trailingStop*Point) {
if(OrderStopLoss()<Bid-trailingStop*Point || OrderStopLoss()==0) {
ModifyStopLoss(Bid-trailingStop*Point); }}}}}}
void TrailingPositionsSell(int trailingStop) {
for(int i=0;i<OrdersTotal();i++) {
OrderSelect(i,SELECT_BY_POS,MODE_TRADES);
if(OrderSymbol()==Symbol() && OrderComment()==Name_Expert) {
if(OrderType()==OP_SELL) {
if(OrderOpenPrice()-Ask>trailingStop*Point) {
if(OrderStopLoss()>Ask+trailingStop*Point || OrderStopLoss()==0) {
ModifyStopLoss(Ask+trailingStop*Point);}}}}}}

void ModifyStopLoss(double ldStopLoss) {
bool fm;
fm = OrderModify(OrderTicket(),OrderOpenPrice(),ldStopLoss,OrderTakeProfit(),0,0);
if (fm && UseSound) PlaySound(NameFileSound);
}
void OpenBuy() {
double ldLot, ldStop, ldTake;
string lsComm;
ldLot = GetSizeLot();
ldStop = Ask-Point*stopLoss;
ldTake = NormalizeDouble(GetTakeProfitBuy(),Digits);
lsComm = GetCommentForOrder();
OrderSend(Symbol(),OP_BUY,ldLot,NormalizeDouble(Ask,Digits),Slippage,ldStop,ldTake,lsComm,0,0,clOpenBuy);
if (UseSound) PlaySound(NameFileSound); }

void OpenSell() {
double ldLot, ldStop, ldTake;
string lsComm;
ldLot = GetSizeLot();
ldStop = Bid+Point*stopLoss;
ldTake = NormalizeDouble(GetTakeProfitSell(),Digits);
lsComm = GetCommentForOrder();
OrderSend(Symbol(),OP_SELL,ldLot,NormalizeDouble(Bid,Digits),Slippage,ldStop,ldTake,lsComm,0,0,clOpenSell);
if (UseSound) PlaySound(NameFileSound); }

string GetCommentForOrder() { return(Name_Expert); }
double GetSizeLot() { return(LotsOptimized()); }
double GetTakeProfitBuy() { return(Ask+lTakeProfit*Point); }
double GetTakeProfitSell() { return(Bid-sTakeProfit*Point); }
double LotsOptimized() {
double lot;
int orders=HistoryTotal();
int losses=0;
lot=NormalizeDouble(AccountFreeMargin()*MaximumRisk/Lot.Margin,2);
if(DecreaseFactor>0) {
for(int i=orders ;i>=0;i--) {
if(OrderSelect(i,SELECT_BY_POS,MODE_HISTORY)==false) { Print("Error in history!"); break; }
if(OrderSymbol()!=Symbol() || OrderType()>OP_SELL) continue;
if(OrderProfit()>0) break;
if(OrderProfit()<0) losses++; }
if(losses>1) lot=NormalizeDouble(lot-lot*losses/DecreaseFactor,2); }
if(lot<0.01) lot=0.01;
return(lot); }