Invalid map cache tiles rendered

I have created a java server page which displays city streets, county roads, etc. and it intermittantly (1% of the time) will give an error when trying to display a map tile. If I zoom out the tile displays ok, and if I zoom in it looks ok, and if I zoom in/out from mapbuilder or from the server itself it also looks ok. Can anyone suggest why this is occurring, and what I need to do to solve this problem. You can look at a png of the error at:
ftp://ftp.mdt.mt.gov/download/mapviewer_err.png
Thanks.

Yes, thank you. That fixed it. Do you have any idea why this occurs. Am I doing something wrong in my rendering process? It is very intermittent.

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