Off the top of my head, I lean towards the solar storms affecting all electronics outside our atmosphere.
However, should the electromagnetic flow around the earth weaken or become spurratic, wouldn't the atmosphere prevent excessive intrusive solar winds
from directly bombarding the earth?
Should a pole reversal or realignment occur with crippled communications and tech, it may be a stones throw for us to end up back in the stone age.
Correct me if I am way off..