@Ricardo Ito
How many devices encounter this issue? Have you tried to clean up the database recently? If not, please try to Run the WSUS Server Cleanup Wizard and clean up the database.
In the past, a lot of guys feedback that the report issue has been resolved be cleaning up the database.
In addition, I found a related case and I want to share with you. Please try to run the scripts on the affected devices and check whether it is helpful.
https://social.technet.microsoft.com/Forums/en-US/e702249e-1cc1-4cfe-b321-972e856fd888/quotthis-computer-has-not-reported-status-in-xx-or-more-daysquot?forum=winserverwsus
Hope the above will be helpful.
Best regards,
Rita
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