The "interconnectivity" weakness

There was a pretty minor glitch caused by an upgrade to the ground control software of the Global Positioning System which impacted a relatively small number of military devices.

In and of itself, not too big a deal, but I've often wondered about the US's reliance on interconnected systems if we ever get in another war with an "a list" country.

Certainly China or Russia (or, more likely, a country they sponsor,) even if it ceded air control, could successfully mess up electronic communications, at least for while before the ground source was nullified. During that period, our electronic advantage would disappear, and I would think the sudden disability would create chaos.