I had this with 2 of them and ended with a spontaneous deflation on the motorway, nearly new and inflated as per the correct specs. Never had issues with kumhos on other cars but on the Ibiza they were noisy and lacked any grip.
 
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Kumho said this in response to my email to them:

"Hi Michael

Sorry to hear that you had a bad experience with one of our products.

We do sell high quality well engineered products, and problems like this
are rare. Unfortunately though they do happen from time to time as a
result of all sorts of different factors. Be that manufacturing fault or
not. This can also be said of all other tyre brands.

You have clearly done the right thing in returning to your local dealer.
The retailer should send the tyre back to us for inspection. If we find a
manufacturing fault with the tyre, we will provide the dealer with an
allowance based on tread usage, this will then be passed back on to you.



I hope this helps.


Kind Regards

Dan Woodward
Brand Manager


Kumho Tyre (UK) Ltd"

So basically I will get some "store credit" if they are found to be faulty, which they clearly are.