I would recommend you to set the pattern matching on software (> debug dataplane fpga set sw_aho yes) to avoid any future occurrence.
This was the suggestion given us by support as well.
However, they also did say that this change will be lost each time we reboot a firewall, which I would concider less handy and make this a not-so-much as permanent fix.
What we're going to do from now on is also have a computer connected to the failing device via the console, and keep it logging in case the issue occurs again.
It's been under a month since it last happened (PANOS 5.0.11) and the issue still persists on PANOS 6.0.2.
If you have any further suggestions, I would love to hear from you.
There is a BUG open with engineering to fix this issue. I do agrre, this is not a permanent fix, only things, you need to re-apply the command if you reboot the FW.
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