From my experience, I think it is unlikely to be due to cosmic rays.Most likely culprit could be power supply or data buffers. Those non tantalum capacitors the

From my experience, I think it is unlikely to be due to cosmic rays.Most likely culprit could be power supply or data buffers. Those non tantalum capacitors then to end of life faster if you're operating in high humidity conditions. This reminded me of a number of random crashes that a client of my previous company had. Stackdumps just showed random errors. We had about a years worth of crash logs from a couple thousand of network switches (they were an ISP). We initially suggested that this might be a problem with cosmic rays. We even checked the frequency of the random crashes with sunspot cycles. No relationship found. Turns out it was due to another component failing due to a design error.