The Ethereum network will be undergoing a scheduled upgrade at block number 9,069,000. While the exact date is subject to change due to variable block times and timezones, the upgrade is currently expected to occur on December 8, 2019.
Ethereum deposits and withdrawals, including ERC20 tokens (USDC, BAT, ZRX), will be delayed by a few hours as the upgrade takes place. This scheduled upgrade only affects Ethereum and ERC20-based token deposits and withdrawals.
Transfers to other CoinJar members via username will not be affected, and trading will not be affected.
You can keep track of the expected upgrade time on Etherscan's website:https://etherscan.io/block/countdown/9069000