Mazda Premacy Gearbox & Clutch Problems

I have replaced the gearbox computer for more than 5 times in 2 years

got a problem with my gearbox when i reach a speed of 60km/h my car revs up sometimes looses power a HOLD sign light shows then immediately pick up and becomes heavy and from there seems not changing gears .the car had been parked for 5 yea...

Pedal has no resistance at all sitting to floor boards wont raise up of floor and gears cannot be selected

what can i do