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A router will not improve your packet loss and latency. What it will do is add another layer of protection between you and the evils of the Internet. Also, if you add another another PC or laptop it will be the conduit for your network.
I have had Linksys (now Cisco) routers and they worked just dandy. Other folks may have a different cut on it.
I hope your connection improves some more; good luck. -- "You can observe a lot by watching". Yogi Berra