diagnosing the diagnostic window

Hi

For some reason I'm losing my connection to simconnect after seemingly random amounts of time. I turned on the diagnostic window in simconnect.ini and I see this after setting level to Warning:

2466.20049 [69] I/O Error! (2, 80004004)
2488.763255 [128] Disconnected! (5, C000014B)

A couple questions:

1. What are the sections of each line?
a. 2466.20049: number of seconds elapsed
b. [69]:
c. I/O Error!:
d. (2, 80004004)

2. What causes an I/O Error? MySimconnect.exe is on the same machine as P3D 1.3. Does it have something to do with the data I'm sending? Could I be overloading simconnect, or sending data that is not the right format?  How can I track down what's causing this?

Help Please!

Thanks
Bobby