The frunk can be opened electronically but it only pops open a couple of cm. It doesn't have a motorized lift system.The frunk is not an electrical opener, it’s a cable 2 step process. How that opened by itself seems impossible.
Opened as in you could lift the hood up or open just a bit? Neither are normal though.It is electrical pop and the trunk was open
Consider disabling hands-free opening.This happened to me too. The trunk opened by itself three or four times while I was around with my PAAK and once when I was driving out of a parking at low speed. Once only the frunk popped.
Now when I park in the city I am always afraid that it can open by itself while going away and I won't notice it.