In troubleshooting, can you access the WorkSpaces through RDP? If not have you tried the instructions connect to a WorkSpaces using RDP?
If you are able to get into the WorkSpace, then you can review the OS logs to see what may be causing the WorkSpace to become unavailable.
You should also enable advance logging on the WorkSpace client and attempt to connect. This will provide you with additional details on when/where in the logon process is failing.
Last, if you have AWS Premium Support plan, please open an support ticket and upload the logs and specify the WorkSpace ID/Information for a support engineer to investigate.
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