IPhone 5s touchscreen keeps freezing?

Every now and again, 5 times a day usually, my touchscreen will become unresponsive to touch. All the other buttons work fine, and all I have to do is lock the phone, unlock it and it's fine. It's annoying however, any help will
be appreciated.

Take it to an Apple Store to be seen about.

Mine gets like that a lot. Turn it completely off then back on, its just a weird glitch.