Yes a powerline adapter could increase the the network connection. Can you check what is your network speed. And do a ping test to see whether the problem does not lies with the router.
How about web browsing, is the internet speed fine or does the internet connection always drop?
jingda
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Packets loss can be due to poor internet connection or the distance. Seems like your Xbox is a bit out of range. You can check with your router to see what is the connection range. Range is usually stated on the top of the router and other reasons. But since your computer is working fine we can canceled out other causes. Try to move your router close to your xbox and see whether that helps
jingda
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