Help Xperia SP multitouch problem?

[Loizos]

Hey,

I just noticed that when I'm pressing the screen with one finger, then trying to hold another finger while still holding onto the screen, there is a small delay in recognising the 2nd finger...

This only happens after 30 minutes of usage, as the multitouch works just fine for a while after powering up.

The delay is not that much, but is enough to not recognise when I'm simply tapping the screen, which makes it impossible to play games like fifa 14 properly, since I have to hold down the button for a while to have a response...

I'm currently rooted, on stock 12.1.A.1.205, on the stock kernel.

Any ideas?

Thanks in advance