Huh. On reset, does the LED flash at the same speed that it used to?
My guess is that you need to reburn the bootloader onto your chip.
I have the same problem with my brand new Arduino NG's. What do you mean by LED not flashing the same speed? Is there a common failure that makes it flash different? faster or slower? And most importantly, why?
I would be very happy if I didn't have to burn a new bootloader, or pay someone to do it. One of the reasons I bought these arduino's was that they were pre-programmed with a bootloader!
Also, if someone could give me a direct link to the source for the actual bootloader used in Arduino NG, that would be nice.