Hi, As much as I wanted to provide guidance, you are testing the MCU beyond its ESD rating which is out of spec. You need to add ESD protection around the MCU so any ESD events reaching the MCU does not exceed its specified rating per JEDEC standards for which the device is qualified against. [quote userid="289759" url="~/support/microcontrollers/arm-based-microcontrollers-group/arm-based-microcontrollers/f/arm-based-microcontrollers-forum/1495503/tm4c123gh6pz-latch-up-and-freezing-of-micro-during-esd"]We have taken care of all the points in the design such as adding ESD diodes, TVS diodes, multi layer PCB, proper shielding and grounding, minimized cables , shielded cable harness, emi-emc gaskets and everything[/quote] Are you sure these diodes, TVS are rated for your ESD voltages ( (+/- 6kV contact and +/-8kV discharge) ? In the meantime, I will check internally any guidance on ISO10605.
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