I lose connection almost 3 to 5 random times a day.

I have two internet connections connected to two wan ports of my ER7206 and the WAn seem to lose connectivity most of the time. I had to reboot the router for internet to both restore connectivity. when this happens I try to connect directly to both my isp routers and seem to be having normal internet connectivity

it's just the er7206 2 wan ports lose connection when I go to their status. 

this started happening after I upgraded the firmware 6 months ago. it was running fine with it's stock firmware by the way

hope some one can enlighten me how to fix this