According to this, a silly game that involves trading cartoon images of cats is bringing down the Ethereum network. Pending transactions and failed transfers have spiked, and it seems to be linked to this game. hopefully its a quick fad, like pokimon go, but if this is successful, even for a short time, there will be clones, and it could kill the netowrk...
https://qz.com/1145833/cryptokitties-is-causing-ethereum-network-congestion/