Shipstation permanently disables auto-updates (order importing) for a store connection if there is ever any connection error. You have to realize updates have stopped, then manually refresh the connection to fix this. To make it much worse, there is no notification when this happens.
Over the years this has caused me to miss new orders repeatedly, sometimes for days, resulting in late shipments. There are easy solutions to this such as sending me an email, or some sort of notification when a sales channel connection has failed and is off.