The sensor should not stop - unless you tell it to.
So it's either noise getting into the sensor and causeing a reboot or the I2C bus hanging is vastly more likely. Google "I2C bus stuck low". The problem is pretty famous.
Both these issues are due to noise - and keep in mind your long I2C traces act like an antenna.
Shielding, stronger pullups, decoupling caps, shorter traces, wider traces with more isolation - are all things to consider.
It's also possible the sensor had a power glitch. This would cause a partial reboot.
Noise on the XShut pin would do the same thing.
I'd pull that up kind of hard.
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