Was having an issue where some pages were failing to load in the browser. Precentral forum pages were a good example - the progress bar got about 15% of the way across then got stuck. Pinging from my desktop showed packet loss so there was definitely a problem.
To solve, I visited Netgear's website and searched for a firmware update. Lo and behold, there was one! This surprised me as the router admin interface checks for updates and was adamant there wasn't one. I upgraded from version 35 to 41 (or a number in the 40s anyway) and the problem went away! Hooray!