You could try updating your firmware... it wasn't hard. But if you are afraid it might go wrong somewhere, then you should probably wait (my USB cable is kind of loose so I was afraid it would loose connection during the update but it didn't ).
Anyway, since the firmware update, I've had no random restarts, the Web browser has never quit, even with multiple windows open. I think I've gotten the "Out Of Memory" error maybe once or twice, but those were rather intensive pages. Still, if I wanted to view those pages, I could turn off my Active Standby to free up some memory and it would probably work.
So all in all, despite the video recording quality indoors, I love my N80. The battery is sufficient for me at least - I talked for about 2 hours yesterday with an hour or two of wifi and it was still at 5/7 bars at the end of the day. I'm thinking about getting a spare battery but I don't think I'll need to.