Hi Lorenzo, This does sound like a power-up reset issue. Since you can also see this after the boards have been off for a long period of time, there may be a power-up ramp issue. If the power supplies do not ramp up monotonically, with dips in the voltage, this could result in the failures that you are encountering. If possible, please measure the supply voltages with a scope during power-up. We do manufacture this device at two different locations, so there could be small shifts in device behavior depending on when you purchased the devices. Regareds, Keith
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