According to our current understanding of quantum mechanics, it is theoretically possible for a macroscopic object to undergo spontaneous and simultaneous quantum tunneling events that would lead to its disintegration. This concept is known as quantum tunneling of a macroscopic object.
Quantum tunneling is a phenomenon where a particle can pass through a barrier even if it does not have sufficient energy to overcome that barrier classically. This effect is a consequence of the wave-like nature of particles at the quantum level. In principle, this phenomenon could apply to macroscopic objects as well, although the probability of such events occurring becomes exponentially smaller as the size and complexity of the object increase.
In practice, however, the probability of a macroscopic object spontaneously tunneling and disintegrating is extremely low due to the collective behavior of the enormous number of particles involved. The more particles involved, the less likely it becomes for all of them to tunnel simultaneously. Moreover, interactions with the environment tend to suppress quantum effects on larger scales, leading to the emergence of classical behavior.
While it is theoretically possible, the probability of a macroscopic object spontaneously disintegrating through simultaneous quantum tunneling events is considered astronomically low and not observed in everyday life. Quantum tunneling is more commonly observed and relevant in the behavior of subatomic particles and in specific contexts such as scanning tunneling microscopy or tunneling in electronic devices like transistors.