My Macbook Pro(2010) only writes in capitol letters, can´t write numbers and only starts up in safe mode once a week!

Hey guys!

So my Macbook started acting weird a couple of months ago. All of a sudden i could only write in capitol letters and i couldnt write any numbers. Every time i tried to write a number, i would only get the symbols instead such as " "#¤%&/ " etc. I tried restarting it and the computer booted in safe mode and still had the same problem as before. I decided to read around some forums and someone suggested " zapping the PRAM" which i did and it fixed the problem for about 1-2 days and then it was back to the normal.

I decided to turn in my computer to an authorized Apple technician to take a look at it and after a few days i got a phonecall saying that he had run tests for 6 hours but couldnt figure out what was wrong with the computer, he just knew that something was wrong. When i got the computer back it was working perfectly but the weird thing is that every now and then the same thing would happen with the keyboard and the weirdest part is that it usually stopped working on fridays, once a week.. Anyways i have done all i can, now im turning to you guys for some much appriciated help.

Any suggestion on how to fix this problem of mine? 😕