Quantum fluctuations generates enough localized negative energy to overcome how weak gravity is at that scale, thereby creating a field of negative gravity in which spacetime and parallel spacetime overlap. This explains quantum leaping because the particle pops out into the parallel spacetime, whips around the big bang and pops back into our spacetime to interact with itself and thusly anything it is destined to becomes entangled with. Our universe actually restarts all the time, but it's pretty much exactly the same, usually. The exception is when living organisms experiment with manipulating this phenomenon to "time travel" by sending signals into the past enough to bubble up to the macro scale and create a paradox time loop. The universe just keeps looping until the paradox goes away from more quantum randomness bubbling up to the macro scale. This has created a trend by which every intelligent species that discovers this eventually ends up restarting the universe, but almost always wipe themselves from the new timeline because the statistically most likely way to prevent a paradox is to just prevent intelligent life from forming on their home planet in the first place. This creates a larger trend that as the universe keeps getting rebooted, less and less intelligent organisms are likely to exist. Since we are alone as far as we can tell, we're likely getting close to the real end where the universe doesn't restart again.