A PSoC needs the xres pin to do a precise reset. This pin is usually accessable and does work.
I would check the following:
Program your project in "Debug" mode using miniprog. Remove miniprog and re-power your board. When not working ==> Probably power/ground problem
When working, program in "Release" mode using miniprog. Remove miniprog and re-power your board. When not working ==> check *ALL* your global variables used in interrupt handlers for "volatile" declaration-
it was a supply problem: cleaning the signal solved the issue.
Thank you for the support,
Thank you, Matt, to keep us informed!