18 R1, keyboard faulty?

The purchased 2 year warranty expired on January 18, 2016.

Keyboard faulty as below:

press"c" *key comes: *c,

press"caps lock" key comes: 3

press"B" *key comes: B6

press" SPACE" *key comes:  *

I tried an external keyboard and it works fine. All other keys are fine so could you please advise if this is also a faulty keyboard?