on my RV340, my VPN site-to-site connection goes down once or twice a week, and upon checking it, the VPN key has reverted back to an old key. Once I re-enter the correct key, the connection immediately changes to UP. Why is the entered key not being saved? I don't have any scheduled reboots, and have saved the running configuration to the start-up config just in case, yet it still reverts back to an old key. also, The log does not show any reboots or any mention of the key being changed other than when i update it to make it work again