OX3B Win32k.sys

[Gopinathsastra]

We have 2 dl380 g1 servers running win2k3 sp2 with 4 GB of physical RAM. We had a blue screen with the following logged.
Abnormal Program Termination (BugCheck, STOP: 0x0000003B (0x00000000C0000005, 0xFFFFF97FFF13C50D, 0xFFFFFADF90AC6D10, 0x0000000000000000))
Analysing the dump file said its probably caused by win32k.sys. Strange thing is we got the same error in 2 minutes interval in another server with same configuration.

One of them is development and another is QA having same applications running, SQL 2005.

On one of the servers this is the first occurence of this and on another there are 3 instances of this another one being in July, so this is pretty inconsistent. Just wondering if there is any way to find what could be causing this or any heads up so that we can dig it further in future.All firmware are upto date.