To see if there's a new firmware release for your router, first log into its web-based control panel (see the section above for help) and check which firmware version you have installed, usually shown on a system or status page. Next, navigate to the website of the router's manufacturer and check the support/downloads section for the newest firmware release for your particular model. Chances are you don't have the latest version; if so, download the latest firmware and follow the instructions on how to update it.
If that doesn't fix your problem, you could also try seeking out open-source router firmware and experimenting with using it to improve your Wi-Fi network. For more details on that process, check out our guide to enhancing your router with open-source software. If you try all these different solutions and your Wi-Fi network is still having problems, it may be time to invest in some new networking hardware (or just head on down to Starbuck's and borrow theirs.)