Dan O. wrote:

I don't see anything else in the circuit besides the timer which is
different between the auto and regular cycles and which could cause
the whole dryer to shut down. I don't see an inspection plate on the
timer used on that model (see the following link) so disassembly to
view the contact might be tricky. But if it's going to be replaced
anyway...

Kenmore 110.66702690 timer
http://ng.appliance411.com/data.php?rc=528909

If it was the timer, I don't think pushing the
"Start switch" would start it up again.

As soon as the dryer motor stops the start would need to be pushed to
start it up again. A bad timer contact which heated due to not making
firm contact might have enough time to cool and reset in the period
between.

It would be unusual for such a bad contact to only fail once than
operate Ok afterward but anything's possible in appliance repair.
Maybe the timer's cam is damaged at one point? Did you notice if the
dryer failed at exactly the same point every time or whether it was at
even slightly different spots?

I've noticed the failure in more than one spot. I'm somewhat
resigned to believing the problem to be somewhere in the switch.
It's the one component in the circuitry that I *can't* eliminate.

http://ng.appliance411.com/data.php?rc=528909
I tried your website just now and had connection problems. Is there
an alternate like to your site that I can follow?

Thanks for the help,
Daniel
--
Daniel S. Schudel