> > One time in about 16, the timer times out not in 40 seconds, but in 3
> > minutes.  The blinking LED blinks at a very slow rate.  But a
>measurement

>This smells like a firmware bug, not a hardware problem.  I bet if you look
>closely you will find some dangling variable in the timer interrupt routine

Maybe it's just coincidence, but 3*40 seconds = 3 minutes.  Maybe if you
looked for some multiple of 3, a value of 3, or maybe 0xFD somewhere on an
upcounting variable.

--Andrew

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