Any simple way to have a VPN client not stop trying to connect?

I run a pair of AC88U with 384.10 that maintain a "permanent" VPN connection between their respective LANs using OpenVPN in the router. For the most part this work great. However, on occasion if one of the respective ISPs has a somewhat prolonged outage (over an hour?) as one of mine did last night, the client side of the VPN gives up trying to reconnect. This requires then manual intervention to turn the client back on. Is there some setting I haven't found or other easy trick that...

Any simple way to have a VPN client not stop trying to connect?