Getting Started - Knowledge Check box is going offline

I’m currently doing the Getting Started module and I’m at the Knowledge check section. The box that i have to get the flags from, is going offline every few minutes, then after a few minutes it comes back online. Everything that I did on the box stay as it was.
However I dont think this is the normal operation and its very hard to hack a box that goes offline every few minutes and that I have to wait.

Also im using the built in vnc browser kali.