ok so a few tips , I got a new custom built rig 3 years ago when the gtx 1080 first came out , I note from the video clip you are using the nvidea experience program , I did and it caused me all sorts of problems because the program THINKS it know best . uninstall the experience software ad the entry for it in start up menu , go do graphics card update yourself on the web site , during install choose custom and UNTICK the experience bit or you will get it again.
next , choose a troublesome game and if it plays up put ALL settings to lowest just to see what happens , if the same things happen you could have a faulty card , just because its new does not mean it is now faulty.
why did you choose i5 when the latest processors are i7.
run memory test in windows program listing.
in the in game chat ask others if what you are playing is capped at 60fps , example tanki x is one that is capped.
put your list of parts into a pc builders "build my pc" to see if it throws up any mismatch
I looked at screen choice 47" and a 24" try each monitor separately , even though you have a very good card you could be asking too much of it but maybe somebody else kmows the answer to that bit.