Hi @davenadler ,
Thanks for your interest in NXP MIMXRT series!
Did your application use semihost? Or did the software reconfigure any SWD-related pins? It's also possible that your hardware caused power supply issues after disconnecting from the debugger. Please help to check this. Alternatively, you can try using serial download mode to directly download the image to the flash memory, then check if it runs correctly.
Because if your debugger correctly programmed the binary file into the flash, it's unlikely that disconnecting from the debugger would cause a crash.
Best regards,
Gavin