I doubt random bitflips are the source of most NT invariant violations. A reboot does fix them all the same though.

Bitflips are surprisingly more common than you think but rare enough to not be a concern.

If you have ECC memory, you can actually monitor this.

I've typically seen ~a dozen bitflips per year per machine when I looked at this on servers, except for the cases of a faulty RAM module.

I am more worried about SSD corruption than RAM bitflips from data I've seen on my systems.