Buttons pressed randomly

I got the same problem. Phone randomly “pressing” screen, only in the right side. Did the screen test and a blur of white lines showed up in the right side with one red square turning green in the lower right side. It is not possible for me to downgrade or do anything at all as the phone keeps accessing apps and activating functions (pressing" whatwever is there to press)
I haven´t updated (as far as I know, so thats not the problem)
What do I do now? send in the phone?
(I have been quite happy with the phone otherwise!)
I hope this can be resolved quickly as i am quite dependent on the little machine…!
Thank you and happy new year!
Asger (Denmark)