MAG524w3 slows down when using ethernet

I have a MAG524w3 and an ASUS GT-AX11000 router. For some odd reason, when I have the MAG connected to the router via Wi-Fi I have no issues with the MAG but, when I disconnect from WiFi to have it hardwired via ethernet, it slows down and starts to lose picture/buffer. I am not using VPN. Does anyone have any idea why this would occur or what setting I may need to tweak to prevent this? Obviously I would prefer to have it hardwired for fastest speeds possible. Thanks for any insight you may have on what may be causing this problem.
 
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