Sudden Fps drops in fortnite for 1 second and back to normal .

@crystalhexagon
Just a second I know what's the problem.

1)First set high performance power plan from nitrosense 
2)After setting up from nitrosense right click on battery option in taskbar and go to power option
after this check your games fps
If problem still persists then better to return and replace or buy another gaming laptop 
But I think problem will solve and this is not hardware related problem

@CrystalHexagon
First play offline games and check if their is any problem
Because fortnite is online game need stable network
Your ping is 130🙏🙏(you can't play game in this ping better to change your connection or optimize yourself)

High ping or latency is only one of the many possible issues when Fortnite starts feeling laggy,low fps, although it is probably the most common.

Btw, add userbenchmark.exe in Nvidia software and set high performance nvidia processor 
Now, run userbenchmark