I’m working on a project using the MKR GSM 1400 and a custom shield for remote monitoring but up to 5 devices have how broken. It appears that the ESD protection diode PRTR5V0U2X (https://assets.nexperia.com/documents/data-sheet/PRTR5V0U2X.pdf) is burning out although I may be mistaken. See below:
What could be causing this issue. With regards to application, the Arduino is connected to 6 current clamps through audio jacks. Currently a DC 12V 3A max power supply is being used which I fear is causing the issue. This was employed since previously the device was restating when the GMS chip was booting due to excess power draw.