TS1381 t, y, u, i and o keys stopped working..

However they work at random times..
Studdenly they work then get stuck again and refuse to work.. is it a hardware issue?

I had a theory on this one, having seen several posts like yours.  But it's only a theory.
The posts almost always refer to a series of numbers that are set adjacent to one another on the key boards.   Not scattered around as may be the case with spillages.
As these circuits are printed, it would not seem unreasonable to have the odd one, and out of such a large production it would be the odd one, where the printed circuit is slightly imperfect or dust in the air caused an imperfection.   I guess if that were the case Apple would be responsible (certainly within the warranty period).   But as I said, it is only a theory.

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