The controls are automatically getting unmapped

Hi,

I have recorded a testscript for a page which contains many panels, textboxes and dropdowns.

But when I run it for multiple times i'm getting errors like panel doesn't exist, textbox doesn't exist. The controls automatically getting unmapped.

//Aliases.browser.pageClientSecurityProject.panel2.textbox.SetText(DDT.CurrentDriver.Value("Client"));

I'm getting error - "The textbox doesn't exist'

Please help me on this.