TextBox Values Disappearing

[Guest]

When a user of my site presses a, say, button to move from one record to
another, and the Page_Load event fires, all of the TextBox fields on the page
are suddenly, and for no reason, blank. IOW, sometimes, when a page is
submitted, all the TextBox fields values become blank.

The first event that fires when a button is pressed is Page_Load.
Sometimes, by checking the values of the TextBox fields during this event, I
can see that they are all unexpectedly blank. This happens maybe once a day
out of perhaps 8000-10000 page submits a day.

Any have any idea what's up with this?