Transmission Stuck In Gear problems of the 2001 Mazda Tribute

Starting 2006 couldn't get truck into reverse and it was hard to find third gear and would be stuck winding between gears on the road and on highway causing possibility of being struck from suddenly being unable to accelerate. Dealer had car for over a week and finally ended up replacing a cable for the cost of $760. 00. Two weeks later the truck is popping out of third gear while driving causing the vehicle to DE-accelerate quickly while struggling to find the gear or next gear. Brought truck back in they said it needs a whole new transmission for $5,800. 00 because it would be cheaper than taking it apart and fixing individual gears. Total new value of vehicle 19,700 before taxes. Kelly blue book value on this year in excellent condition only 5,700. The truck only has 57,000 miles on it now. Just made last payment two weeks before problem started.