Timeout while waiting for sandboxed code execution request to complete within the worker process

Hi Im using sharepoint 2010 Online (BPOS) site.

I have deployed a visual sandbox solution in the list Edit form. The List have contain around 4000 rows.

Now while users tries to edit the List item, im encountering with time out error.

But edit form opens while users attempt for some more time.

Can i know the cause and solution for this problem. Its urgent.

Thanks in advance.

Anand B