I have seen it sometimes but not recently. I had seen such messages primarily on sandboxes that too when the environment upgrade was nearby. There can be various reasons why this may happen, not sure if any can be pinned down.
It is advisable to contact your Microsoft Partner/CSP and ask them to troubleshoot by viewing Telemetry Logs. Your partner/CSP can also raise this as a support ticket to Microsoft & they'll help you get an answer
Your ticket with Microsoft will have highest priority if this has been happening on Production environments. If possible, support your query which you send to your partner/CSP with screenshots and a summary of what actions you were doing in BC when this happened
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