@BigPalo sounds strange 😛
Prior to waisting time with troubleshooting I would recommend that you upgrade to the recommended version of PAN-OS 9.0 which is 9.0.13. The list of fixes which were implemented between 9.0.9 and 9.0.13 is almost endless, so the chances are good that this restart no longer happens after the update and if it still does, then troubleshooting this problem will make sense.
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