MC320N0 deleted my application

Hello!

I Installed my application in MC32N0 for my client.

my client living in Mexico.

The OS of MC32N0 is English.

For match Date format to SqlServer I set Date format at Regional setting as America.

And I set Date&Time as Mexico.

At that time Date&Time automatically initialized to 2005.

I do not know the reason.

But my Application runs good.

Then after around  1 month, my application deleted from MC32N0 device anyhow.

Nobody did it manually. I do not know why my application deleted by MC32N0 device.

And the Net work setting is initialized.

Does anyone experienced similar situation?

And does anyone know the reason?

How I can fix it?