Two wired devices keep dropping from the network every 24 hours

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I have two devices, an Airport Time Capsule for backups and an airport express for airplay that are set in bridge-mode and non-wireless mode that are both connected to the telus router via ethernet cables. I can get them connected, but the connection seems to drop every 24 hours. To get the connection restored I have to go into the router settings. As soon as I hit 'save settings' they both re-connect.

 

I've given them each a DHCP reservation to help with the problem, but to no avail.

 

Would love some help with this. Thanks!