There's a reason that our entire modern world doesn't come crashing to a halt around us every 30 seconds. If every CPU was vulnerable to bit flips from random radiation, every part of your house would be on fire and arcing electricity. Times Square would look like the bridge of the 60s enterprise under attack.
Actually, every CPU _IS_ vulnerable to bit-flips from radiation. That part of it is not speculation. It does occur in commodity processors, and with probabilities large enough that we have ECC ram, and ECC and/or parity in caches. Some servers actually come with built in hardware fault tolerance methods, because when you run hundreds of servers non-stop for years, the probability that a particle strike screws up a register on chip is non-negligible. Now, still, the probability isn't _huge_. Definitely not high enough to be causing these specific problems, especially when the failure is always in the same manner. _That_ part of it is pretty much bullshit.