sounds like you may have some traffic pattern that is causing the firewall to trip. It could either be something that causes a memory leak (which support should be able to find fairly quickly) or something a little more nefarious that causes this issue
in the latter case, you may end up needing to packetcapture whatever is going into the firewall the moment it 'crashes'
Do you have zone protecton profiles and packet buffer protection enabled on your zones?
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