I have noticed this also. However, since I employ the reboot methodology occasionally, it does not phase me.

My theory is that the car is supplying massive amounts of electricity to the accessories in the car (from the 12v battery) fan, lights, radio, A/C etc, that the suddent drop from 2-3krpm to 800rpm puts a strain on the car.

Ease the car back into the gear desired, and use a little more than usual care letting out the clutch.

I have not perceived this to be a big issue and would not consider taking this in for service.

-Charlie...