Could be, since depending on how heavy the scene is, the GPU of the laptop might go nuts, and yes it can happen that it will also eat the hard disk memory ( this happens to me a lot when using Maya for example ), so keep an eye on the hard drive and see if you notice any changes.
Every time UE4 crashes a pop up window appear, so usually you can also see what is the cause, so that you’ll know what’s going on.
If something else come up, feel free to annoy 