My New Masterreplica Vader FX lightsaber occasionally doesnt go thru the complete power down sequence (power down sound effects and sequential LED shutdown)

Instead on occasion (one time out of 30 maybe) when turning the unit off, it just turns off without the powerdown sound effects and LED shutdown sequence. Power up is fine and all sounds motion detection and clash effects are fine. It is brand new and not abused. Is this normal do you think?

THanks

ps love this unit and the Luke Skywalker ESB FX I just received.