Adf page display garbled

One of our ADF application that runs in the standalone web logic server, shows the page display garbled. (rows and columns display one over the other - messed up)
This application runs for months ok and suddenly the page display is garbled.
Then when we restart the managed server (in which this adf app is deployed) it displays fine there after.
Does anyone can think of why this happens?
Thanks

Which jdev version?
I guess you can't reproduce this behavior?
Sometimes a server starts missbehaving if it runs out of memory or other resources.
Timo

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