Suddenly touch screen problems. - Desire 816 Q&A, Help & Troubleshooting

Hello all,
I bought an htc desire 816 3 months ago so its still under warranty.
A few days ago i installed a service pack that was available for update and i noticed that my touch screen got ****ed.
It happens randomly and usually not for very long but for a few hours. To press a key you have to press it multiple buttons and its just so frustrating and hectic.
The touch screen works normally after a while too.
I dont understand what the problem is, i cant even roll the software back.
What should i do?
Thanks

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