Infura is the foremost Ethereun infrastructural provider. As it faces outages, exchanges are shouting down ETH and ERC20 withdrawals. Also, it is confirmed that MetaMask is facing the same difficulty as Infura is its default service provider.
In response, the Infura page says:
“We are currently experiencing a service outage for our Ethereum Mainnet API. Our on-call team is investigating and working to restore service functionality,”