The simple truth in the matter is that when news announcements are happening the central banks widen their spreads, so any broker that has guaranteed spreads has no choice but to lock up, requote, slip, what ever. If they are guaranteeing 3 pips and the true spread at central banks is 10 or 12 they have to do something to cover that difference in spread and that's why they will always fail in one way or another in fast markets.
My recommendations: If you have $5,000 US or more look into Interactive Brokers. Their platform is mutifunctional so it's a learning curve and 50.1 leverage. They have low pip spreads but they also charge a comission on trades. My second and preferred choice is OANDA. You can trade from $1 to $10,000,000. Excellent fills in all market conditions. They too only offer 50.1 leverage and their charting is very lacking but it's all about the fills right? I also have a second account with a broker which has MT4 and micro trading so that I have the excellent charting capabilities and I can make small token trades with them just to stay active. Just no trading during active markets with them.