Bitcoin network to my knowledge can not be hacked but a personal wallet can also be hacked, thus, this could be as a result of exposure your seed phrase to theft and if such happens they swipe off your wallet by sending out the Bitcoin Inside the wallet. Again, Bitcoin network can't be hacked but it's configured on an open network where other people can tap to the network by building their projects on the Bitcoin network, this cause network congestion or high transactions fees because there is now a competitions on the network on whom is to be given a higher priority and at the process of this you see people increasing their transaction for them to include as the higher priority. And of course, the Internet can not be shutdown for any reason or for even a day as lot could happen including affect human life.