IPSec Issue with Meraki MX65 and PFSense box

[NoNotSquirrels]

Hello,
I have a Meraki MX65 firewall with a site to site to a virtual PFSense box, software version (Current Base System
2.3.3_1).

Meraki Settings
Phase1
Encryption:  3DES
Auth: SHA1
DH Group 2
Lifetime: 28800

Phase2
Encryption:  3DES
Auth:  SHA1
PFS Group: OFF
Lifetime: 28800

PFSense Settings
Key Exchange version:  IKEv1
Internet Protocol:  IPv4
Interface:  WAN
Remote Gateway:  a public static IP
Authentication Method:  Mutual PSK
Negotiation Mode:  Main
My Identifier:  IP Address (The local public static PFSense box IP)
Peer Identifier:  IP Address (Same IP as above from Remote Gateway field)
PSK:  The same on both sides, manually typed in
Encryption Algorithm:  3DES
Hash:  SHA1
DHGroup 2
Lifetime:  28800
(Advanced Settings)
NAT Traversal set to Auto
Dead Peer Detection is enabled (delay 10, max failrues 5)

Phase2
Mode Tunnel IPv4
Local Network "Network" IP Subnet/16 off to the right for what is local to the PFSense box
NAT/BINAT None
Remote Network:  "Network" IP Subnet/24 for what is local to the Meraki firewall site

Phase 2 Proposal
Protocol: ESP
Encryption Algorithms:  Only 3DES checked
Hash Algorithm:  Only SHA1 checked
PFS Key Group: OFF
Lifetime: 28800
Ping Host:  IP of a server on remote end

The tunnel comes up with phase 1 going active.  If I select "Status"–> "IPSEC" from the menus I can see phase1 established.  If I click the "Show Child SA Entries" the section at the bottom shows bytes in and packets in increasing but the bytes out and packets out are at zero.  Randomly within the 8 hour tunnel window, bytes out / packets out will suddenly start increasing and traffic between the two sites will work.  It will run for a while, 2-3 hours, and then drop.  Have opened Cisco Meraki ticket and they checked MX side, they "believe" the PFSense box is not seeing the request to build phase 2, which sounds odd.

To note, I have 5 other IPSecs from other locations going through this PFSense box without issue.