Are you using a wifi extender for your wired uplink? Maybe thats losing its link to your main router? I'm thinking out loud really.... Mine kicks out occasionally and I have to Redo everything but thats once or twice a year.
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One more thought. If your not already maybe try setting a static IP address for the Apex instead of it using DHCP. That way it'll use the same IP every time there's a blip. What I found with mine is if it restarts and gets a new IP from DHCP then it'll never reconnect to Fusion.