Row editor firing an insert instead of update the record

[Satapathy]

Hi,
I am new to Ext JS and need your help for the same problem
I am using the Ext JS version 3.3.1. I have been struggling record update problem in row editor.
I am doing updates/insert on some records using the RowEditor plugin. Updates/Insert of new record is working fine upto
few minutes. But after few mins suddenly grid is not refershing, store is not loading all data from the database.
If I click on a record, its roweditor is opening. I am trying to modify the record. But, unexpectdly I could see instead of
updating the record, it is inserting new record(different id) which is a duplicate record into database.
And as I have already problem of grid not refreshing (after few mins) I cannot see the duplicate record until I manually
load the screen again. Code looks like:

var store= new Ext.ux.data.PagingJsonStore({
autoLoad: true,
autoDestroy: true,
autoSave:false,
timeout:60000,
autoload: {params: {start: 0, limit: PAGE_SIZE}}

//After every updates:
grid.getStore().reload();
grid.getView().refresh();
So, need your help how to refresh the store/grid automatically after every update and how to avoid duplicate record insert into database?

Thanks in advance.
Please help

[Satapathy]

Hello mitchellsimoens,

Help me please for the above problem.

Thanks in advance