AWS S2S VPNs not re-establishing?

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AWS S2S VPNs not re-establishing?

L4 Transporter

Having issues with a fair amount of AWS VPN tunnels that will go down due to path or ISP issues but they don't come back up unless I manually bounce them on the PAN side.  Configuration is standard with DPD set to 10/2 and using PBF monitoring the far ends of the tunnels.   So I will see the tunnels go down and they show down in AWS but they DO NOT come back up until I manually bounce them from the IPSec Tunnels page.  


Has anyone seen this before?  I am seeing this across 2 separate PANs (1 x HA, 1 standalone) to separate AWS accounts/regions but the problem seems to be consistent and not sure why.  


Note I am not using 'Tunnel Monitor' on the IPSec Tunnels but I am on the PBF rules, could that be the problem?  Meaning I should be using TM on one or the other but not both?  Someone show me the way.  

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