Galaxy S5 pressing things on its own

[KashinEU]

A few days ago my phone just suddenly started pressing buttons on its own and ignoring my button presses. Turning off the screen and turning it back on again fixes it temporarily, but within just a few seconds it will often continue again.
Is this a virus? Or is my phone broken? Nothing happened to cause it to break.

 

[Rukbat]

It could be a virus, it could be a bad digitizer or it could be a bad motherboard. It has to go to the shop for analysis.