Flash Trade - Number of strategies per account and instrument

Hello,

I am currently trading 12 strategies for long positions in a specific account and 12 short positions in other account all of them trading FESX contract. For whatever the reason in the last sessions has appeared a flash trade that last 1 or 2 seconds in the first bar of session (like the one in the file attached). When I write to Ninjatrader team they told me it was crazy to have so many strategies running at the same time in the same account and instruments. I would like to know,:

1) Is there any way to avoid this flash trades????
2) How many strategies can Ninjatrader handle over the same account and instrument?. I cannot believe it is only one strategy per account and instrument. So far I reduce last sessions to 3-5 strategies per account and instrument and flash trades that not come up any more.

Regards,