I have a similar situation to macworth, I'm literally only running the router as a wireless ap and a gigabit switch because as a router it just couldn't handle it, perhaps 4 computers doing basic web browsing and 1 pc doing occasional torrenting was too much to ask.
Reflashing 1.32NA didn't fix any problems I had previously and I never backup/restore settings as I know them all, it had many issues with SharePort as it would not stay connected for more than half an hour at a time.
However after flashing the new beta, stability returned that I haven't seen in a long time, I can only assume it was able to flash properly this time because the firmware was not meant to do anything like that, SharePort is now working correctly and it is rock solid, I still don't use the router for anything more, but the wireless part has improved.