python qt4 unknown fatal error

Hi,

I have Ubuntu 10.04 LTS with python 2.6.5 and python-qt 4.7.2.

I built a simple application that uses 2 threads. One thread is for drawing pretty windows and the other executes all the stuff.

There are 2 points while executing where the application crashes randomly with one of the following errors(it changes randomly):
<unknown>: Fatal IO error 11 (Resource temporarily unavailable) on X server :0.0
<unknown>: Fatal IO error 0 (Success) on X server :0.0

Sometimes it works just fine.

This is happening randomly and I have no idea why. Is this a common/generic error that happens for some obvious reason?

Please let me know if I need to provide more info about the application.

Please help
Thanks