Whatever is the source, I really hope it's not malicious. The US is vulnerable.
PS - This doesn't mean it is unrelated to the Spring/T-Mobile merger, they themselves could be the ones who screwed up routing.
This is because of an update in the systems from the Sprint side to help
merge with T Mobile. That happened from 12am-6am EST and Sprint's systems
clashed with T Mobile's. I'm glad I have off today.https://www.digitalattackmap.com/
US and Brazil both under a massive DDOS attack right now.