Strange VXL/Specktrum behaviour?

[jpoprock]

I know yer not supposed to turn the radio off before you turn the ESC off, but I accidentally did this today, and it caused me MAJOR grief!

I wrecked my E-Jato last week and broke one of my Alum links. I finally got those all replaced yesterday, and spend hours dialing in my vehicle. I got my
3s lipo all charged up and ready to go too. I'm running a VXL motor and ESC, and using a Spektrum DX2.0 radio and receiver. But for some reason with THIS set up, if you turn the radio off before you turn the ESC off, the truck takes off full throttle in reverse! I learned this the hard way this morning... when literally seconds into my run, I accidentally turned my radio off, the truck shot off in reverse like a rocket, and slammed into of all things, a concrete block, breaking my rear arm! So... my test run was ruined immediately!

This has happened to me before, with different results. Normally, my veh's won't take off like a shot though. What could be causing this to happen???

Jason