About once every month the router will magically wipe out all configurations forcing me to reinstall the configurations from a backup file. The router isn't mine, but I've to help my old aunt who has it (a friend of mine has it too, and he has similar problems). Imagine that, at least once a month I've to take a call from her requesting me to come over to fix the blasted router.
At times the wireless portion will fail so she is forced to connect to it via the 10/100 wired port. Only once reinstalling the wireless configuration would it work again. Updating the firmware is difficult too, with it constantly rejecting the firmware file I downloaded from Linksys's own website. Even once I got the latest firmware onto it, it still deletes the configurations once a month.
An utterly useless product (this is her third one). Shame as when it works, it works well. Looking at networking forums it seems that many has experienced similar problems. Avoid at all cost.