TF Stepspeed will only drive when it's cold outside

Hi, i have a Problem with my 2002 MGTF Stepspeed. When it's cold in the morning, everything works fine and car drives perfect. If the car warmed up and i stop the engine and will restart after a minute, the transmission display has no sign and he only drives in limb mode. Also when the weather is fine and warm, he starts without transmission display and only limb mode, so i can't drive anywhere.

When he drives normal and i stop the car, i can stop ignition and start it right back in a few secounds without loosing the system. If i wait 15-20 secounds, i will lose it.

I have changed the oil, but is the same.

Maybe Steppermotor inside the gearbox?





I have read so much in the last day's about stepspeed problems, but nothing found like that.



PLZ help me to fix my loved car and sorry for my english :-)

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