RUNTIME ERROR '3146'..ODBC-Call Failed -

Hi..

Im using SQL server as my backend and MS Access as F.E..

Im using to update around 10 to 20 records one by one by upto 2 to 3 records it was updating, later for 4th record it was saying "RUNTIME ERROR '3146'..ODBC-Call Failed"(at "rst.update" it was showing)
..at that time if i start agian from "rst.addnew" then for upto 3 to 4 it was okay..Is there any limitation in adding records.???
FYI: Im not getting if i update 1 or 2 records..and
one more thing that i came to know was ,If the table was a ordinary Access Table..Im not getting any error..
One more thing was If i place some time delay using msgbox (like msgbox "Updated..." for example)that means for each record I placed a message updated..then it was working perfectly on to my surprise..


Please help me in this regard..Please..

Thanks & regards
Anu...