Bitcoin Exchange Finance will suspend deposits and withdrawals in the Ethereum network and tokens and ERC-20 during the migration of the blockchain from the proof-of-work algorithm (Pr) to Proof-of-Stake (Pos).
According to the developers' plans, the Bellatrix "consensus level" (Beacon Chain) will be updated around September 6. Presumably, on September 15, the Paris upgrade of the "execution level" (mainnet) will be activated.