As posted in another thread.
I've had 12 days Uptime, but I'm still getting lockups. The lockup just occurs farther between than other users.
I caught the router locking up today. I logged into it, and attempted to retrieve the logs, where the router reported that it was running low on memory. A second attempt specified that the router was out of memory and then completely locked up. Depending upon your usage of the router, this might explain why different usage patterns can lead to widely different experiences.
I get a lot of extraneous logged due to 2 FIOS settox boxes broadcasting on what the -4500 considers an unroutable network. It should just ignore the traffic, but it logs an entry, once every few seconds. Additional traffic due to what happens on the network or WAN facing can lead to a very full log. I don't see any way to trim or adjust the log retention values. If I uncheck INFO, I don't believe this actually reduces the level of logging, it only reduces what is displayed. The logging information is still kept in the router memory.