Datagridview problem

Question

Hi,
In a form called form2 I have a datagridview. From another form named form7 I enter some vaues and it is stored into the db and immediately after that the form2's dgv is updated and it shows the values, but within one minute the values that are displayed in a particular row of form2's dgv disappears. I don't know why it is happening so? Can anyone help me in figuring out this datagridview's behaviour.
 
Thanks