Vehicle randomly quits, shuts down with no warning, does not set a code, only does it when driving it

What is your question?

The vehicle shuts down with no warning, does not set a code, only does it when driving it. Took to dealer they told us nothing was wrong with it but they didnt drive it and said they couldn't fix since did not set a code.

What makes this problem better or worse?

It is so random, we cant pinpoint

How long has your 2007 Cadillac Escalade had this problem?

It quit on us 4 times and we got it home from dealer and it's been parked ever since, we cant trust to drive it.