Delay in powering up after powering down?

[TheBundo]

I notice often that when I power down, then go to power back up right away, the power button is like it doesn't work, but if I wait a couple of minutes or so, it powers right up. I haven't timed where the "break point" is, but it is there. Is it possible that the phone is doing some kind of memory-dump/write or something after appearing being powered down, and won't restart until it's finished?