The reason why so many coins are going offline before a high volume of trade is likely due to the fact that the token name of the coin is no longer supported by the exchange or platform it is being traded on. This could be because the token name has been changed, or the exchange may no longer be offering support for the token. In addition, the exchange may be making changes to its platform or infrastructure in order to accommodate the increased trade volume. Whatever the reason, it is important to keep track of any changes that are made to the token name and platform in order to ensure that the coin is still available to trade.