You can manually trigger DHCP address release and renew from the command-line with the 'dhclient' utility, but it's worth checking the cable first and then the setup on the router, as those are the most common issues.
If you haven't, it's also a good idea to make sure that your router is running the latest firmware, as manufacturers will always release new versions after the product has been on the market a while and bugs have been found.
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