Here are things that by your logic are "network down":
* Nano - when network got spammed, user transactions didn't got confirmed, but spam did. Network down?
* IOTA - when payments were disabled for whole month and only 0-value data transactions went through. Network down?
* Bitcoin - China lost power, 30% hashrate disappeared, blocks weren't mined in every 10 mins on average for 2 weeks.
* Ethereum - Geth follower certain rules, Parity followed other rules, Infura wasn't updated because unannounced hard-fork.

What do you call those networks, that can be re-orged with 51% attack? Network f-ed? Can't happen on Obyte, but happens on blockchains.