Anyone else having problems with Trailing Stops not working with ThinkorSwim while Day trading? I am using a 2% trailing stop based on the MARK at time of entry, and sometimes the trailing stop order gets triggered 60 seconds or so after the entry before the security moves even .1% in either direction. The order is set up as an advanced OCO order like this: Buy Market order which triggers a bracket order of these two OCO orders -- 2% trailing stop -or 3:45 pm Sell Market order. So, for instance, the Buy Market order will create a position in the stock for $100, then the trailing stop will activate prematurely sometimes just 60 seconds or so after the market order creates the position, and I will end up exiting the position at $99.89 or some such, no where near the 2% stop loss level of $98. And this is occurring on days even when there is very little volatility. The stock is not running up to $102, and then falling hard and triggering the 2% trailing stop. The stock is literally barely moving and the trailing stop is being triggered for no apparent reason. I have had this happen about once out of every 8 or 9 trades I execute using this advanced OCO order. It's creating a big problem for the semi-automated Day trading strategy I'm creating. Any insights?