I'm using QuoteTracker and several times each morning my IQFeed feed will stop getting data or will lag badly behind InteractiveBroker's data. I think it's IQFeed and not IB's problem because none of my charts update and I'm able to execute trades at the displayed NBBO on IB which may be 0.10 or 0.20 away from what IQFeed is showing (on a $25 stock like LVS).

I experience the same thing when using custom applications so I don't think this is a QuoteTracker bug. My system stats show 60% Memory usage and none of my 4 cores show more than 70% usage so it's probably not a hardware issue (and, as I've said, IB is still updating).

Is there a way of fixing or tracking down this problem?

Sounds unusual. I use SierraChart and never had any problems (tick charts of @ES, @NQ, @YM, USO, UNG, COMPX.X, INDU.X, SPX.XO, TICK.Z) . IQFeed and TWS go hand in hand, news events included. There might be an occasional discrepancy one way or the other, but nothing serious (in sub-second range).

I'm subscribed to 200-300 symbols and they all stop at the same time, several times each morning, for 3-15 seconds at a time. Nerve wracking for scalpers like me.

adrian, it sounds like you might be short on resources somewhere (CPU/RAM/Bandwidth/etc)...

Our customer service department should be able to help you identify the issue if you contact them via phone or chat.