Cannot Turn off Smart Connect!

I have posted this before...doing so again, as I am looking for further help.  Each day, normally around 3pm. my devices lose connection and freeze up.  Sometimes my digital photo frames and ALWAYS my Amazon Echo Show 5.  I have done factory resets on the devices.  I have unplugged the units and the RS500 router a hundred times.  I even just did a factory reset on the RS500, but that was because it turned on Smart Connect by itself and grayed out the option to turn it off.  Even with all that, each day, my items freeze around the same time.  The only thing I can think of is the DHCP leases ending every 24 hours.  Is there any way to exclude a device from doing so?  I have already set a reserved IP address using the mac address of my echo show 5.  Has not helped.  I did an experiment and connected it to my phone as a hotspot around 250pm....it did NOT freeze up at 3 as it normally does.  So it seems to be the router.

Does anyone have any ideas, solutions....does anyone else have this issue?  I am on the latest firmware.  I did also re-flash to last FW...same problem.  So went back to the current FW.  I have tried everything I know to do....turned off and on protection engine, QoS, etc.  I really thought that by reserving the IP address, it would fix it for the echo show 5, but nope.  Thanks.