1 Nickel

keys not working on inspiron 11 3000 2 in 1


there is a problem in my dell inspiron 11 3000

some keys{ caps lock, a, tab, q, z, esc, 1,`} 

don't work some times

they dont do anything for a long time

then suddenly start working very fine like nothing is wrong and work very good for 10-15 minutes.

then they stop working again,

they dont do anything

plzz help how to fix this