Spawning Monster for Horror Game

So I’m currently working on a horror Walking Simulator and want to spawn a Monster near the player.
The monster itself has a BP which destroys itself when the player is hitting a sphere collider, so the player can’t approach the monster.

After a given time the monster should spawn randomly near the player, but it won’t do that.

The BP itself is actually calling the Spawn Actor, but the Monster won’t appear at all. After it has called the spawn actor, nothing happens any more.

I even tried to hide the monster instead of destroying it and make its collision disabled. Then, when its spawned again, it would get unhidden and its collision would turn back on.

The BP of the monster which destroys itself

The BP of the Player, which should spawn the monster. Part 1/2

The BP of the Player, which should spawn the monster. Part 2/2

Okay quick update:
If I don’t hide the monster nor destroy it, it will spawn correctly. Now, how do I “vanish” the monster when the player is approaching it and then spawn again after given time?