Unhappy [Q] LG G2 browsing and touch screen issue

Hello! My LG G2 has begun reacting strangely lately, although I have it for only one month. When browsing the Internet (whatever the browser), there are times when I cannot scroll through the websites. Insted, when I try to scroll, links or photos are selected and I have to click elsewhere or hit the back button for the menu to close. I found a similar video to my situation (only first 25 secs of the video). Youtube title is "T-Mobile LG G2 Touch Screen Issues Part 2 " but it's not allowed to post it here.

Also, when I open a full screen app or video, pantom touches appear sometimes. Both problems occur once in a while (not always), but when they do, it is nearly impossible to use the phone. Locking-unlocking solves the problem, but only temporarily (for not even 5 minutes). Please help!!! Thank you in advance