Excel 2007 throiwng RPC failed/RPC Unavailable exception on large datasets

Question

Hi,
Following is log of an error that we  are frequently getting while invoking excel and  perfoming calculations using asp.net (Excel 2007)
17Jul2009 13:03:42  INFO  ODSReports.OrdStatsByPercentGraph - .Creating chart for OrdStatsBySKU
17Jul2009 14:14:51  WARN  ODSReports.ODSExcelFunctions - Unable to programmatically set <CenterFooter> of PageSetup. Page formats might be incorrect. Please check and set Page setup options manually.The remote procedure call failed. (Exception from HRESULT: 0x800706BE)
>>>>>>>.Exception  here - Remote procedure call failed. Note that the chart prep has taken 1 hr + 


17Jul2009 14:14:51  WARN  ODSReports.ODSExcelFunctions - Unable to programmatically set <RightFooter> of PageSetup. Page formats might be incorrect. Please check and set Page setup options manually.The RPC server is unavailable. (Exception from HRESULT: 0x800706BA)
>>>>>> RPC is unavailable...
Notes:
1) We get this error  only when we use a large dataset (e.g.  working with > 10000 rows). Things work perfectly when  we use smaller datasets (e.g. 1000 rows  etc)
2) We did not see  this on Excel 2003. Excel 2007 seems to be slower and also having this problem.
Do you know of  any info/issues  regarding excel 2007 and RPC disconnect/timeout etc ?
Thanks a lot for your  time