S2S FG2FG Tunnels down and cant ping 2 of 3 sites

Hi there all!

Still new and learning FortiOS and the hardware, I have had some great help in this sub from some amazing people! and now i need a bit more help! This afternoon one of my 3 tunnels ( 4 sites in total ) when down. so i rebooted thinking that may solve the issue. and instead it took down another tunnel. I did some googling and YTing. First thing i tried was Pinging the Public IPs. and Sure enough i couldnt ping those two tunnels! both from FG CLI and from Windows BUT i could ping that address from the Comcast Modem! and if i go to the other 3 sites i can ping from all 3 back to the main site! Anyone have any ideas on where to look and what maybe broken? was working for the last 2 weeks!

** I made these S2S using the S2S FG templates in the IPsec Wizard **

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Any help would be great! i will be up all night trying to fix as they need this to print remotely for payroll tomorrow :) Thanks guys!