Inconsistency

[Sparr]

I have had some problems with shellcoding, where somtimes my code works, and sometimes not. I can run the exact same code multiple times, but  it doesnt always work. In the beginning it fixed itself by reloading the page or resterting the challenge, but now I have tried the same code that worked earlier many times, and it still doesn't work. Anyone else experiencing this? Any tips? (I use the VScode workstation).