Strange issue with SDWan

I have 2 ISP and using SDWan. Nothing crazy most just fail over and routing streaming services over second ISP. Last night fortigate went offline and couldn't ping either outside interface. Been working for month no changes on our end. Tested ISPs and both working with static IP. Out of a whem I disabled wan2 SDwan interface and it come online. Enable wan2 sdwan interface instantly lost pings to outside interface on wan 1.

Figured I would try disabling wan1 sdwan interface and again everything works over wan2...

Desided to try a different isp for wan 2 and worked fine.

Baffled set everything back and as soon as I enter the ip in wan2 sdwan gateway everything drops again.... I set it to different gateway and wan 1 works again and as soon as I set it back to correct gateway ip on wan2 everything drops. Can't ping outside interface on either wan.

Any ideas?