Printer Driver behaving abnormaly

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Hi All,
I have written a unidrv based printer driver for a USB printer. I have
implemented rendering and UI plug ins.
Sometimes the driver behaves abnormally sometimes-
1. Occasional "striped text" or text that appears to be halftoned.
2. PC side crashes of Windows "Generic Host Services"(svchost.exe).
3. Missing or "Black Out" objects on the printed page - Most non-text
graphical objects, including images, are not visible on a printed page.
(This happens always).

Is it a result of stack corruption in my driver?
If so what are the things that corrupts the stack and how can i
increase the stack size for my driver?

If somebody knows it, please reply...

Thanks,
Nitin

.

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