Looking for help with Stack issue...

To begin I best point out the project was built using sample code. Somewhere in this code or my implementation of it, the stack reduces on each key processed and eventually the board resets. I added code to report the stack size after each process and it is being reduced and eventually reboots, ( something is being pushed to the stack but not popped)...

It's not major (if you don't mind the board resetting every so often), but it has to be fixed... any help appreciated...

The touch detection should probably be an interrupt (instead of inside a loop), this may account for stack issue...