Make sure the firmware of your device is up to date. Test the device on a different computer. Check the system report to see if the device is still recognized. Make sure the device is connected directly to the coputer and not behind another device. If available, temporarily replace the cable. 
Plug the cable into a different port, both on the device and on the computer.Make sure the cable is plugged in securily.If you were using Software RAID and everything works after removing the RAID set, re-create the RAID set and test the disks again.Depending on the results, either replace the faulty disk or return the device for repair. If yes, swap the disks and check if the problem follows a certain disk or stays with one particular drive slot. Use Mac OS Extended when formatting the disks. Remove the RAID set and erase the individual disks.
If you are using Software RAID, backup all your data in a different location first. If you are using a file system other than Mac OS Extended (HFS+) like APFS or FAT32, backup your data, format the drive using Mac OS Extendend and test it again. If you have encrypted the drive, decrypt it and test it without encryption. If available, run First Aid to check your disk for problems. Go to Applications > Utilities and open the Disk Utility. Add the external drive to the privacy list. On your Mac, go to Preferences and open Spotlight. If you are using a laptop, you might have to do this twice, once for Power Adapter and once for Battery, depending on when the problem occurs. Disable the option to put hard disks to sleep when possible. Following are some tips on how to troubleshoot such an issue: There could be different reasons why an external drive suddenly disconects, so if possible, it's best to try and narrow down the problem by testing different configurations and settings. Why does my drive disconnect from my Mac? FAQ - Frequently Asked Questions - Knowledge Base
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