I'm another one customer who found IB stop-order is getting unreliable these few weeks.
I have been trading IB for past 2 years and I generally have no problem with the stop-buy or stop-sell order execution. But these few weeks, the stop-order would just hang there even when the real-time price is way above (for stop-buy) or way below (for stop-sell) the trigger price. And I'm using SMART routing. Direct routing to the specific exchange is even more unstable.
When you ask their customer service, they ask you for information. When you give them all the information you have, they ask you to be even more specific. WTF, the stop-order has not even been trigger and executed, how specific can I give you the information.
If too many customer complain about the same thing, please just go and check your system. Please check your change log, and undo any thing that made your system unstable and unreliable. Do not always assume that your customers are always newbie in trading and know nut about order execution. And when they tell you that there are something wrong somewhere and call you, please be humble to go back and check your system.
When your customer service ask for more information when there are no more information I can think of, he/she just explose his/her unprofessional way of handling the matter and show ignorant in trading execution.