before that they recommended a reboot and I did it. The problem was solved. The after that I opened a case and they said this:
I apologize for the issues you've been experiencing with the high utilization of your MX.
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After investigating, I found that there is a known backend issue causing high CPU utilization following the upgrade to firmware version 18.211.3. As a workaround, we would need to disable the backend feature internally on your MX and downgrade it to version 18.211.2, which is the current stable release.
I recommend reaching out to our support team at your convenience by calling +1 415-937-6671. We’re available 24/7, and any engineer will be able to assist you with this issue.
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I never called them. The whole backend issues sound fishy to me