Quark 80B Problem - Help please!

Hi Guys,

I really LOVE my Quark 80B, but it's acting strange if I drive with nimh packs. I'll try to explain it: If I'm driving sometimes the car just stops, and I can only steer, but no gas. After 5 secs or something I have to give full throttle forwards and after that full throttle backwards, then there comes some kind of strange beeping. (It's the same beeping as if you switch the on/off thingy to on, and then to "start the quark" you've to do the same as I said here above, and then I should drive normal with my car) And then I can just drive. But then after some driving the same happends.

First I thought it was the on/off switch who had damage, so I soldered those 2 wires together. But the problem still is there.
But, the strange thing is, if I drive with my 3S LiPo I haven't got any problems at all!


I really don't get it, could someone please help?

Thank you,

Patrick