I am a home user and have modem---opnsense box----router---local network
Everything is running fine and I can connect to the opnsense gui.
After about an hour the gui just locks and I can not reconnect.
Box is still working fine and everyone can get where they want, but nothing can connect to gui.
STRANGE PART just to try I rebooted the router and now I can again connect to the gui
so how do I keep the box happy with the router?
That's an unusual setup. The additional router appears to be the one blocking traffic. You might want to look what's going on there...