2wd shoots into reverse when tranny switched off first.

[Maddog73]

Hi guys,

I've recently bought a Hobbywing 100a speedo for my Mad Rat, set it all up as it should be and is running well.
However..... if I switch my tranny off first (which I know isn't really good practice) the car shoots off in reverse until tranny switched on again. My radio gear is an Ansmann 3.1 2.4ghz set.

Any ideas appreciated?

Thank you.