It comes from not leaving go of the frites when you type I think
Sorry - mes excuses - couldn't resist, not often you get a chance here in the fragrent harbour.
The power supply problem comes with most machines when you don't run the power cycle from full to empty and only then recharge, and they only have a limited number of cycles (somehere between 250 and 600 I think I read somewhere).
The Keyboards - different people, different hitting styles, the more you write the quicker they wear out - best solution posted elsewhere is to use an external Kbd. wherever possible - cheaper to scrap when tired.