When FortiGate is enabled with memory logging, default specific amount of memory space will be allocated for memory logging. Memory logging is not suggested in Lower/middle end firewall,you can configure either Disk or external logging like Fortianalyzer for logging.
memory logging is not suggested in Lower end firewall, for troubleshooting any specific issue or for monitoring the traffic logs locally, it is possible to enable the memory logging and disable it later.
I just need it to do some fast troubleshooting but anyway I need it. Is there any daemon or service to bring it back alive without restarting the device? And my main question still on the table: why it happens just to this device among many ones?
As for your FortiGate in 6.4.5 version - there was an older bug in 6.0 versions where logging would randomly stop after a few days, but 6.4.5 is not affected by this. I did have a poke through our bug database, but couldn't find anything logging-related that matches what you described so far, so I'm not sure what's going on.
I would suggest you open a ticket with FortiGate Technical Support for further investigation.
+++ Divide by Cucumber Error. Please Reinstall Universe and Reboot +++
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