There could be folowing problems in gear box.
It may need chamber cleaning and oil change.
One or more plates could either be worn out or damaged.
Not sure about computer problem.
There is a guy in Rawalpindi, Waheed near chohr chowk, he runs a garage called Young Autos, it is on the left side of road when you travel toward peshawar from saddar. I had same kind of trouble in my LC's gearbox and first time he had a look on it, advised me to change gearbox rather than repairing it, which was around Rs 80,000 that time. I did not take his advice and did everything else to stick with same gearbox, even at the end I got it repaired but it did not work. So at the end after spending more than 80k on it and went back to him and got one replaced with a new version which was over 1 lakh.
He is very expert guy and very well educated, will give you best advice.