As per the previous responder are you hard-wired? If you are hard wired into a switch or directly into your router what colour are the corresponding lights. Typically if the lights are Orange then normally this means your connection to the switch is 100 Mbps whereas green lights typically mens the connection is operating at 1 Gbps (check your manual for confirmation) - if you have a Gigabit device but are receiving a 100 Mbps status then try restarting that device (I had the same issue myself a few weeks ago and the good old "on & off" resolved it for me). Equally I have had a Gigabit switch that developed a fault and would only give me a 100 Mbps conenction. A faulty ethernet / LAN cable could also be responsible (if hard wired aim for Cat 6)
Regardless of a wired / wireless connection you could always try a manual restart of your device anyway.
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