Keyboard problem: some keys are working randomly.

Hello,

I have an Inspiron 15 5570, and since like 1 month some keys doesn't work for a bit of time and then it works just fine, especially the keys at the bottom of the keyboard (c, v, b, n, space bar, arrows, number pad...). I reinstalled the keyboard drivers, without success.

What can cause this ? How can I solve it ?

Thanks for your help,
Adel.