Hi, I am Mike Wilson and I am working for troubleshooting Garmin Express devices. Usually, problems with Garmin Express not working are associated with the use of outdated software or communication problems with the connected device. Also, the problem occurs when a computer fails to meet the minimum system requirements. Besides these, the other trouble causing culprits are external USB hubs, USB extension cables or USB ports on the monitor or keyboard. USB cable without a decent data transfer speed can too lead to error generation.