Network - Wireless & Wired Connections

Help & troubleshooting for network issues, including connecting your device to your home Wi-Fi network, connecting to public networks, troubleshooting wireless issues & ethernet connections, and optimizing streaming performance.
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Consistent Network Issue and Reboots of Roku Ultra but not Streaming Sticks

I am having problems with my Roku Ultra on an everyday basis.  Buffering and the Poor Network Message but every time I check my WiFi Connection I'm in the 75mb download area.  I have 4 other Roku Streaming Sticks and they worked basically perfect.  No buffering.  No poor network messages.  All are on the same exact network.

My Ultra also locks up and reboots on its own at least once a day.  Again, no such issues with the Streaming Sticks.  

I've checked the Updates daily and other than a few App updates I haven't seen any software updates since installation.  

I'm thinking I just have a defective unit.  Can I get this replaced?