Does DMAIC Work in a Fire-Fighting Situation?

I often encounters some fire-fighting tasks. A latest example, the key customer reported a new defect that dropped their yield significantly and we were ordered to get a instant improvement otherwise stop to supply them goods. In this case, we have no time to validate any possible root cause but take immediate action based on the potential causes. It seems DMAIC do not work in fire-fighting. After fire eased, we usually take a relief rather than apply DMAIC methodology to find out how the fire begin.

Do you have similar experience?