Yes, loss of power at the board would be unusual from the thermostat. I re-read the information above.
A short in the heating element (or thermostat) could cause the board to go out and even fry. The board has safety features that will shut it down to protect itself. However, you can lose the board (totally dead and doesn't come on again) also if they don't engage quick enough.
You would want to check the heating element (as explained above).
If the thermostats are meeting spec (as you indicated) and you find the element is good then... you can either try replacing the thermostats (they could be failing under voltage and you really can't check that) or go for the board (which is expensive if it's not it).
This is a very electronic focused machine and there are specific diagnostics that you would use.
So, I've uploaded the service manual and a couple of tech sheets for you.
When you go to the site to download do not use AOL. Use Internet Explorer or another browser because that site does not like AOL. Choose the "Free" option. After you download the file you will need to open it with Adobe or another application. You should already have that on your computer.
Sometimes, the site is a little glitchy. If you have difficulty, clean your temporary files and your hard drive, restart the computer and try again. It's definitely worth it to have the right information. You can go to the top right corner and save the PDF file to your desktop for easy access.
Please click here - repair manual
Please click here - Tech sheet cabinet
Please click here - Tech sheet
Let me know if you would like more information or clarfication.