Brain of Cthulu won't spawn every other time I use the bloody spine

Ok so all the requirements were right. I was in an artificial crimson that had worked the first time I summoned the brain, the the second time I summoned it, the it said that the brain of cthulhu has awoken and it played that boss roar sound, but no brain. The third time it worked, the fourth time it didn't. Every other time I used the bloody spine the brain would not summon.
Best Answer
If you're getting inconsistent results summoning the Brain, I'd recommend making sure your artificial Crimson biome is large enough to allow it to spawn off-screen and travel to you without being outside the Crimson.
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How do you Respawn the brain of Cthulhu?
The Brain of Cthulhu is summoned in one of two ways: Destroying three Crimson Hearts in the Crimson biome, the alternative to Shadow Orbs in the Corruption biome, which spawns the Eater of Worlds. Using the Bloody Spine boss summoning item, crafted with 30 Vicious Powder and 15 Vertebra.Does the brain of Cthulhu Despawn If you leave the Crimson?
The Brain of Cthulhu can only be spawned and fought within the Crimson. As of 1.3. 1, the Brain of Cthulhu will despawn if you leave the Crimson.Terraria Brain Of Cthulhu 1.4 [EASY GUIDE] [Console, PC, Mobile]
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