If your toaster is automatic beyond belief, you should be in awe but not afraid, for this alien technology bestowed upon us by the ancients is benevolent and incorruptible.
But a modern toaster? That could kill you in your sleep!
So you're basically saying it's a cosmic entity from galaxies away that has been lurking for aeons in the empty shadows of space, thirsting for sentient life, and it has been attracted in our vicinity by our foolish experiments, gotcha.
It's just a creative way to express a fantasy, in actual fact circuits left running that long in outter space that has random electron radiation passing through it is bound to degrade over time...