SB 900 with thermal sensor "off"

It's clear that almost all SB900 users who have the thermal sensor on have experienced annoying shut downs.

So the question is:

If you are using an SB900 with the thermal sensor off (and the beep off) have you experienced any shut downs when shooting flash intensive assignments like weddings, prolonged outdoor fill flash portrait sessions or press/newspaper work?

Is it holding up as well as an SB800 in the same situation?