Phase 2 (Each proxy ID) should be negotiated according to the key lifetime, so if in one side it's set to 5 minutes that's normal. You don't usually want to re-ley that often, if you're receiving delete messages the re-keys need to be troubleshooted in the side deleting the SA. If the other side it's also a palo alto a rekey can be triggered if tunnel monitoring is detected as "down",
https://live.paloaltonetworks.com/t5/Configuration-Articles/Understanding-behavior-of-PBF-and-Tunnel-monitoring-probes/ta-p/68666
You can check the remaining lifetime for your Phases 2 with the following command,
>show vpn flow.
Regards,
Gerardo.
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