Thank you for getting back to us.
The problem you have linked to is resolved. It was related to the Nolics data layer and the code mentioned in the blog post is already part of the Sitefinity code. Can you make some further investigation and see if this is manifested on certain pages only? Pages that have the same controls - custom or built in controls. You can try using ELMAH error logger to see if it will capture such problems. You can see instructions on how to set up Sitefinity with ELMAH here
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