EDIT:
Here is a quick cellphone pic of the buttons. The number 5 button (SW10) is the most unresponsive, and it has its cover removed in this photo:

I had a recommendation to put a tiny switch inside the switch. I'm going to order a few from digikey and see if any fit and could be connected up to the leads without too much problem.FX23 wrote:i have the same problem with my ex8000, i look forward to the solution
Crafter57: Could you please share the source of your parts for replacing the EX-800 switches please? Many thanks!crafter57 wrote:Had the same issue with my EX-800, the switches are actually shorted because they have metal contacts inside. If you desolder the switch and look on the backside under microscope or magnifying glass, you will see the actual manufacturer name and you can search it that way. That's what I did and was able to find replacements